BAB I PENGAMBILAN SAMPEL TANAH ( SOI L SA M PL I N G ) SOI
CAPAIAN PEMBELAJARAN:
Setelah mempelajari bab ini mahasiswa dapat melaksanakan kegiatan pengambilan sampel tanah, baij yang asli maupun tertanggu sesuai prosedur yang benar dan dapat mengumpulkan berbagai informasi serta menggambarkan dalam grafik mengenai hubungan antara perubaha kadar air alami terhadap kedalaman. 1.1
PENDAHULUAN
Pengambilan sampel tanah merupakan kegiatan yang paling awal dilakukan dalam pelaksanaan praktikum laboratorium Mekanika Tanah I yang dimaksudkan untuk mendapatkan sampel tanah, baik yang asli ( undisturbed ) maupun terganggu (disturbed ). ). Sampel tanah tersebut nantinya akan digunukan dalam pengujian pengujian selanjutnya di laboratorium. Sampel tanah asli dapat diperoleh dengan menggunakan tabung sampel (tube ( tube sampler ) atau tabung sampel belah ( split spoon sampler ) untuk mengambil tanah dasar luabang bor yang telah dibuat sebelum melalui pemboran dangkal/tangan ( shallow/hand shallow/hand boring ), ), ataupun sampel tanah berbentuk kubus ( block samples) samples) yang diambil dari lubang galian/sumur uji (test ( test pit ). ). Tidak termasuk dalam kegiatan ini adalah pengambilan sampel tanah melalui pemboran dalam ( deep boring ) dengan menggunakan bor mesin (boring ( boring machine). machine ). Selain itu, melalui kegiatan ini dapat pula dibuat deskripsi susunan lapisan tanah dan diketahui tinggi muka air tanah setempat.
1.2
PERALATAN
Peralatan yang digunakan dalam pengambilan sampel tanah menggunakan metode sumur uji (test (test pit ) adalah: 1. Peralatan untuk mengambil (cangkul, sekop, ganco, linggis, dll) 2. Sendok spesi, spatula besar dan alat-alat yang sejenis
1
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3. Rol meter, palu kg dan balok kayu berukuran (4 x 6 x 60) cm 4. Tabung sampel tanah dengan tutup 5. Cawan (container (container ) untuk penentuan kadar air) 6. Tempat untuk sampel tanah tertanggu (karung/tas plastik) 7. Kotak yang terbuat dari kayu berukuran (20 x 20 x 20 ) cm serta lembaran plastik secukupnya untuk pengambilan pengambilan sampel tanah asli.
1.3
PROSEDUR PENGUJUIAN
Prosedur dalam pengambilan sampel tanah menggunakan metode sumur uji (test pit ) adalah: 1. Menentukan lokasi yang akan diambil sampel tanah serta bersikan permukaannya dari rumput atau benda-benda benda-benda lainnya, 2. Membuat lubang dengan ukuran (100 x 100 x 100) cm atau dengan ukuran lain sesuai petunjuk instruktur, 3. Menyisakan tanah berbentuk kubus dengan ukuran (20 x 20 x 20) cm pada dasar galian mulai di kedalaman 100 cm, atau mengambil sampel tanah asli dengan menggunakan tabung sampel tanah, tiap kelompok minimal 3 (tiga) tabung sampel tanah, 4. Membungkus tanah asli tersebut dengan alumunium foil atau plastik, bila pengambilaanya dengan tabung sampel tanah maka tabung sampel tanah dapat ditutup dengan plastik atau menggunakan malam/parafin, serta mengambil sampel tanah setiap kedalaman 50 cm atau setiap terdapat perubahan lapisan tanah untuk mengetahui mengetahui kadar airnya, 5. Memberi label identifikasi agar tdak tertukar bila sampel tanah lebih dari satu serta menyimpan sampel tanah tersebut ditempat yang teduh.
1.4
PELAPORAN
Semua data yang dijumpai selama pelaksanaan kegiatan, harus dicatat langsung di lapangan pada profil sumur uji maupun profil bor, yang meliputi: 1. Tanggal mulai dan selesainya kegiatan,
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3. Referensi lokasi ada ketinggian titik-titik pengujian terhadap titik-titik tetap terdekat, 4. Ketinggian muka air tanah, 5. Keadaan cuaca pada pelaksanaan.
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Tabel 1.1 Lembar pengujian hasil bor tangan ( Hand ( Hand boring ) KEMENTERIAN KEMENTERIAN PENDIDIKAN DAN KEBUDAYAAN KEBUDAYAAN NASIONAL NASIO NAL
POLITEKNIK NEGERI MALANG LABORATORIUM MEKANIKA TANAH Jl. Veteran PO.BOX 04 Malang 65145,Telp. (0341) 575750 Fax. (0341) 575750 email : mektan.polinema@gmail
[email protected] .com -
[email protected] NAMA
:
N I M
:
Loka si
: Ds. Se ndi Ke c. Pa ce t Ka b. Mojoke rto
Jl . S oe oe ka ka rn rno - Ha tt tta no no. 9, 9, K Sa mpe l
: Di sturb/ Undisturb
Ke K e lompok : 2
Ti tik/ke da l a m a n
DOS DOSE EN
Tanggal pengujian
: Dand Dandun ung g Nov Novian ianto to,, ST. ST.,, MT. MT.BH-01 BH-01 / 02,50 m s/d 15,00 m
: 1/ 1 m : 12 Maret 2016
HAND BORING / TEST PIT LOG Kedalaman (m eter)
0.0 0.2 0.4 0.6 0.8 1.0
Catatan Catatan :
Bor Log
Simbol Gra fik
Deskripsi Tanah
U SC S
Coklat muda, plastistas tinggi Coklat, plastisitas tinggi Kecoklatan, plastisitas sedang Coklat Tua, Plastisitas Sedang Coklat kehitaman, plastisitas rendah Kehitaman, plastisitas rendah
Pengambilan tanah untuk benda uji
LABORATORIUM MEKANIKA TANAH - POLITEKNIK NEGERI MALANG JL.SOEKARNO HATTA NO. 9
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BAB II PENGUJIAN KADAR AIR TANAH (w) (WATE R CONTE CONTE NT )
CAPAIAN PEMBELAJARAN :
Setelah mempelajari bab ini mahasiswa dapat melaksanakan pengujian penentuan kadar air dengan prosedur yang benar, dapat melakukan perhitungan kadar air serta dapat melakukan perhitungan kadar air serta dapat menggunakannya dalam perhitungan-perhitungan untuk pengujian yang lain. 2.1
PENDAHULUAN
Kadar air tanah adalah perbandingan antara berat air yang terkandung dalam masa tanah terhadap berat butiran padat (tanah kering) dan dinyatakan dalam prosen. Kadar air tanah merupakan salah satu parameter tanah yang penting untuk menentukan korelasi antara perilaku tanah dengan sifat-sifat fisiknya. Oleh sebab itu, pengujian atas kadar air tanah merupakan salah satu pengujian yang selalu dilakukan setiap penyelidikan tanah. Pengujian menggunakan metode kering oven ( oven drying method ), ), yaitu memanaskan benda uji pada suhu (110±5) ºC selama 16 s/d 24 jam. Pada keadaan khusus apabila tanah yang diuji berupa jenis lempung dari mineral monmorolotine/helosite, gypsum atau gypsum atau bahan bahan organik (misalnya tanah gambut), maka suhu pengeringan maksimum dibatasi sampai 60 ºC dengan waktu pengeringan yang lebih lama. Penentuan kadar air tanah sedapat mungkin dilakukan segera setelah penyiapan bedna uji, terutama bila cawan yang digunakan digunakan berkarat.
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2.2
PERALATAN
Peralatan yang digunakan dalam pengambilan sampel tanah menggunakan metode sumur uji (test (test pit ) adalah: 1. Oven yang dilengkapi dengan pengukuran suhu untuk memanasi benda uji sampai (110±5) ºC, 2. Cawan dengan penutup dan tak berkarat (terbuat dari gelas/aluminium), 3. Timbangan dengan ketelitian 0,01 ; 0,1 ; 1 gram 4. Desikator, berisi selica berisi selica gel , 5. Penjepit (crublice (crublice tongs). tongs). 2.3
BENDA UJI
Jumlah benda uji yang dibutuhkan untuk pengujian kadar air tergantung pada ukuran butir maksimum dari sampel tanah yang diperiksa dengan ketelitian ket elitian seperti dibawah ini. Tabel 2.1 Saran penggunaan timbangan berdasarkan ukuran butiran.
Ukuran butir maksimum lolos ayakan
Berat benda uji yang disarankan
Ketelitian timbangan
Lolos # 40 (0,420 mm)
10 s/d 50 gram
0,01 gram
Lolos # 4 (4,75 mm)
100 gram
0,01 gram
12,5 mm
300 gram
0,1 gram
50,0 mm
1000 gram
1 gram
(95-100%)
2.4
PROSEDUR PENGUJIAN
1. Menyiapkan benda uji yang mewakili sampel tanah untuk diperiksa,
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3. Meletakkan cawan tersebut dalam oven dengan suhu (110±5) ºC minimum 16 jam (atau sampai beratnya konstan), 4. Mengambil cawan dan benda uji yeng telah dikeringkan, kemudian menaruhnya dalam desikator yang berisi selica gel untuk didinginkan, 5. Menimbang cawan beserta isinya (benda uji kering + cawan = W 2), 6. Membersihkan dan mengeringkan serta menimbang cawan tersebut (W 3), 2.5
PERHITUNGAN DAN PELAPORAN
Kadar air dihitung dengan rumus sebagai berikut:
− 100% ………………….. = = …………………..…..……….. …..……….. (2.1) − Dengan : Berat cawan + tanah basah
= W1 gram
Berat cawan + tanah kering
= W2 gram
Berat cawan
= W3 gram
Berat air
(Ww) = (W1-W2) gram
Berat tanah kering
(Ws)
= (W2-W3) gram
Contoh perhitungan kadar air cawan 1:
Diket: W1 = 13,23 gram W2 = 11,02 gram W3 = 9, 32 gram
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2.6 KESIMPULAN
Dari percobaan yang telah kami lakukan, kami memperoleh hasil berupa kadar air tanah yang yang nilainya di di atas 100%. Kadar air tanah rata-rata yang kami kami peroleh adalah sebesar 138,9 %. Meskipun bentuk tanah tidak berupa tanah gambut, kadar air di atas 100% ini dapat terjadi karena tanah memiliki rongga yang banyak dan kandungan bahan organik tanah yang tinggi.
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Tabel 2.2 Lembar hasil pengujian kadar air tanah (water ( water content )
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BAB III PENGUJIAN BERAT ISI TANAH (γ) (UNI T WE WE I GH T OF OF S OI L )
CAPAIAN PEMBELAJARAN :
Setelah mempelajari bab ini mahasiswa dapat melaksanakan pengujian penentuan berat isi menggunakan silinder tipis dengan prosedur yang yang benar, dapat menghitung menghitung besarnya nilai berat isi,serta dapat membuat membuat benda uji uji buatan (remoulded samples). 3.1 PENDAHULUAN
Berat isi dari suatu massa tanah adalah perbandingan antara berat total tanah terhadap isi/volume total tanah yang dinyatakan dalam notasi ᵞwet (gram/cm3). Seperti halnya kadar air tanah,berat isi tanah juga merupakan sifat fisik tanah yang penting sehingga pengujiannya dilakukan secara rutin bersama-sama dengan pengujian lainnya di laboratarium. Pelaksanaan pengujian ini menggunakan metoda silinder tipis yamg di masukkan kedalam tanah (drive (drive cylinder method) sehingga tidak dapat dilakukan pada jenis tanah berpasir lepas atau terdapat banyak kerikil. Sementara itu dalam pengujian pemadatan taah di laboratarium atau penentuan kepadatan tanah di lapangan, berat isi tanah dinyatakan dalam berat isi tanah kering γdry yaitu perbandingan antara berat butir tanah terhadap volume total
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3.2 PERALATAN
1. cincin (ring) (ring) besar/kecil, besar/kecil, 2. Jangka sorong, 3. Pisau/spatula, 4. Timbangan dengan ketelitian 0,001 gram.
3.3 PROSEDUR PENGUJIAN
1. Membersihkan dan mengukur volume ring besar/kecil besar/kecil (V) serta menimbang beratnya (W1), 2. Meletakkan bagian ring yang tajam ke permukaan tanah dan menekannya dengan hati-hati sampai tanahnya masuk seluruhnya ke dalam cincin, 3. Memotong dan meratakan kedua sisi ring dengan pisau dan mengusahakan agar tidak sampai berlubang pada kedua sisi ring tersebut, tersebut, 4. Bila ada sedikit lubang maka menambalnya dengan tanah yang sama, 5. Membersihkan sisa-sisa tanah yang menempel pada bagian luar ring kemudian menimbang ring yang berisi tanah (W 2).
3.4 PERHITUNGAN DAN PELAPORAN
Berat isi tanah dapat dihitung sebagai berikut :
γwet =
− V
Dengan:
gram/cm3 .……………………………….………… ……………………………….………….. .. (3.1)
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Contoh perhitungan berat isi tanah ring 1:
Diket :
W2 = 70.49 gram W1 = 39.77 gram D = 3.8 cm t = 2.33 cm w = 141.84 % (telah diketahui pada perhitungan berat air pada
tanah) V = 26.42 cm3
Berat isi tanah basah =
wet
=
=
W2W1 V
gram/cm3
.−. .
= 1.14 gram/cm3
3.5 KESIMPULAN
Berat isi tanah basah rata-rata yaitu sebesar 1.16 gram/cm3. Hal ini
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Tabel 3.1 Lembar hasil pengujian berat isi tanah (unit ( unit weight of soil )
KEMENTERIAN PENDIDIKAN DAN KEBUDAYAAN NASIONAL POLITEKNIK NEGERI MALANG LABORATORIUM MEKANIKA TANAH
l. Veteran PO.BOX 04 Malang 65145,Telp. (0341) 575750 Fax. (0341) 57575 email ema il : mektan.poli mekta n.polinema@ nema@gmail gmail.c .com om - mektan.pol mektan. polin inema ema@yahoo. @yahoo.com com
N A M A N I M Kelom Kelompok pok DOSEN DOSEN
: : : :
Kelom Kelompok pok 2 Lokasi Lokasi : Sendi - Pacet - Mojokerto Sampel Sampel : Tan Tanah asli asli (Undi (Undistu sturb) rb) Titik/ked Titik/kedalam alaman an : 0.80.8 - 1 m Kelom Kelompok pok 2 Dandu Dandunng Novian Novianto, to, ST., MT Tang Tanggal peng pengujian jian : 14 Maret Maret 2016
BERAT ISI TANAH ( ASTM D 2937 - 83 ) BH-01
Titik Kedalaman
(m)
00.8-1
0.8-1
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BAB IV PENGUJIAN BERAT JENIS TANAH (G s) ( SP E C I F I C GR SPE G R A V I TY OF SOI L )
CAPAIAN PEMBELAJARAN:
Setelah mempelajari bab ini mahasiswa dapat menentukan nilai berat jenis (Gs) tanah berbutir halus di labolatorium dengan
prosedur yang benar, dapat
menggunakan nilai Gs yang diperoleh untuk menghitung besaran sifat-sifat fisik tanah penting lainnya. 4.1
PENDAHULUAN
Berat jenis tanah (Gs) adalah perbandingan antara berat butir tanah (Ws) dengan berat air (Ww) yang mempunyai volume (V) sama pada temper atur tertentu. Berat jenis tanah diperlukan untuk menghitung indeks propertis tanah (misalnya: angka pori (e), berat isi tanah (γ (γt), derajat kejenuhan (Sr), serta sifat sifat penting tanah lainnya. Selain itu dari nilai dan berat jenis dapat pula ditentukan ditentukan sifat
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5. Thermometer ukuran 0 – 0 – 50 50 ºC dengan ketelitian pembacaan 1 ºC, 6. Ayakan nomor saringan #4, #10, #40, 7. Tungku listrik (hot ( hot plate) plate) , 8. Bak rendaman Air dengan Pengatur suhu ( constant temperature bath), bath), 9. Air suling.
4.3 BENDA UJI
1. Sampel tanah diambil antara 50 – 50 – 100 100 gram , kemudian dikeringkan dalam oven dengan temperature (110 ± 5) ºC, 2. Setelah kering, sampel tanah dikeluarkan dan di dinginkan dalam desikator, 3. Sampel tanah diayak melalui a yakan No. 4 (4,75 mm) dan atau No. 10 (200 mm) kemudian menyiapkan benda uji sebanyak ± 10 gram apabila menggunakan
piknometer
100
ml,
masing-masing
sebanyak
3
).
sampel.
4.4 PROSEDUR PENGUJIAN
1. Mengambil 3 piknometer kapasitas 50 ml atau 100 ml, mencucinya dengan air bersih kemudian mengeringkannya dalam oven. Mengeluarkan dan
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yang sama (constant (constant ). ). Setelah suhu constant , menambakan air suling lagi sampai penuh dna menutup piknometer tersebut. Mengeringkan bagian luar dan menimbang beratnya
),
5. Membersihkan piknometer, kemudian mengisinya dengan air suling sampai penuh dan memasukannya pada pada bak pengatur suhu dengan dengan nilai suhu 25ºC. Memasang tutup piknometer setelah isi piknometer sudah mencapai suhu 25ºC , kemudian mengeringkan bagian luar piknometer serta menimbang piknometer beserta isinya dan tutupnya (W4). 4.5 PERHITUNGAN DAN PELAPORAN 4.5.1 Kalibrasi Piknometer
1. Membersihkan, mengeringkan, menimbang, dan mencatat piknometer beserta tutupnya (W1) 2. Mengisi piknometer dengan air suling dan memasukkannya ke dalam bak pengatur suhu (constant temperature bath) bath ) 25°C. memasang tutup piknometer setelah isi piknometer sudah mencapai suhu 25°C., kemudian mengeringkan bagian luar piknometer serta menimbang piknometer beserta isinya dan tutupnya (W 25)
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Tabel 4.1 Faktor koreksi terhadap suhu T (Suhu) 18 19 20 21 22 23 24
Faktor koreksi K 1,0016 1,0014 1,0012 1,0010 1,0007 1,0005 1,0003
T (suhu) 25 26 27 28 29 30 31
4.5.2 Perhitungan Berat Jenis Tanah
Berikut rumus untuk perhitungan berat jenis tanah :
GL
Faktor koreksi K 1,0000 0,9997 0,9995 0,9992 0,9989 0,9986 0,9983
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4.6 KESIMPULAN
Berdasarkan hasil perhitungan, didapatkan berat jenis tanah rata-rata sebesar 2,51
specivic gravity of soil ) Tabel 4.2 Lembar hasil pengujian berat jenis tanah ( specivic
POLITEKNIK NEGERI MALANG LABORATORIUM MEKANIKA TANAH
Jl. Veteran Ve teran PO.BOX PO. BOX 04 Malang 65145,Telp. 65145,Telp. (0341) 575750 575750 Fax. (0341) 575750 email ema il : mektan.polin mekta n.polinema
[email protected] @gmail.com - mektan.poli mekta n.polinema@
[email protected] yahoo.com om
NAMA
: Kelompok 2
Lokasi
: Ds. Ds. Sendi Kec. Pacet Kab. Mojokerto
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BAB V PENGUJIAN ANALISIS UKURAN BUTIRAN (G R A I N SI S I ZE A N AL AL Y SI SI S )
CAPAIAN PEMBELAJARAN :
Setelah mempelajari bab ini mahasiswa dapat melaksanakan pengujian analisis ukuran butiran dan distribusinya, baik yang berbutir kasar (kerikil/pasir) maupun yang berbutir halus (lempung/tanah lolos saringan no. 200) dengan prosedur yang benar, serta dapat mentabelkan dan menggambarkan analisis butiran tersebut.
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3.
Oven dengan pengatur suhu sampai 110 ºC,
4.
Mesin penggetar saringan,
5.
Tala,
6.
Kuas, sikat kuningan, sendok dan alat-alat lainnya.
5.2.3
Prosedur Pengujian
1.
Mengeringkan benda uji di dalam oven,
2.
Menyaring benda uji lewat susunan saringan dengan ukuran saringan paling besar ditempatkan di atas,
3.
Menggetarkan saringan ± 15 menit,
4.
Menimbang benda uji yang tertahan pada masing-masing saringan.
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Dengan :
υ
= Kecepatan turun butir-butir butir-butir tanah (cm/detik)
γs = Berat volume butir-butir tanah
(gram/cm3)
γw = Berat volume air (gram/cm3) η
= viscositas / kekentalan air (gram.detik/cm2)
Supaya mendapatkan hasil yang lebih baik maka digunakan hidrometer yang berfungsi untuk mengetahui spesific mengetahui spesific gravity larutan gravity larutan setiap waktu pengamatan. Dari hasil tersebut didapatkan data yang setelah diolah akan diperoleh grafik distribusi butiran yang merupakan hubungan antara diameter dan prosentase.
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4.
Mengambil sampel tanah yang akan diuji baik kering maupun tidak, kemudian jadikan satu dengan larutan (3) dalam glass beaker dan mengaduk sebentar serta menyimpannya selama 24 jam.
5.3.4
1.
Prosedur Pengujian
Memindahkan semua campuran tanah dan larutan ke dalam mangkok mixer
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10. Memindahkan benda uji dari ayakan ke cawan (yang sudah diketahui beratnya) dan mengovennya, setelah kering menimbang cawan beserta benda uji, lalu mengayak dengan ayakan No. 4, 10, 20, 40, 60, 100, 200.
5.3.5
Perhitungan dan Pelaporan
Rumus-rumus yang digunakan :
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D = Diameter butiran L = Jarak yang yang ditempuh butiran (lihat Tabel 5.3) t
= Waktu pengamatan
K = Koreksi terhadap temperatur dan Gs (lihat Tabel 5.4)
Contoh perhitungan analisis hidrometer: hidrometer:
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Tabel 5.1 Koreksi Ct terhadap temperatur
Temperature (ºC) 15 16 17
Tabel 5.2 Koreksi (a) terhadap (Gs)
Ct
Berat Jenis Tanah (Gs)
Faktor Koreksi K oreksi (a)
- 1,10 - 0,90 - 0,70
2,85 2,80 2,75 2,70
0,96 0,97 0,98 0,99
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Tabel 5.3 Perbandingan bacaan hidrometer terkoreksi oleh meniskus (R) dengan
jarak yang ditempuh oleh butiran butiran (L, Ieffective (L, Ieffective depth) depth) R
L
0
16,3
1
16,1
2
16,0
R Lanjutan ..... 31 32
L 1 1 ,2 1 1 ,1
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