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(1, gambar) (2, gambar) (3, gambar) (4, gambar) (5, gambar) (6,gambar)
3b. (1,2,3) (1,2,4) (1,3,4) (2,3,4)
3c. Kota A ke B ada 4 jenis (dibagi jd a,b,c,d), kota B ke C ada 5 jenis (dibagi jd 1,2,3,4,5)
(a,1) (a,2) (a,3) (a,4) (a,5)
(b,1) (b,2) (b,3) (b,4) (b,5)
(c,1) (c,2) (c,3) (c,4) (c,5)
(d,1) (d,2) (d,3) (d,4) (d,5)