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If a1 a2 a3 a4 a5 ...... is a sequence ...

If `a_1 a_2 a_3 a_4 a_5 ......` is a sequence of duplets `(0, 0), (1, 0), (0, 1), (2, 0), (1, 1), (0,2),(3,0),(2,1),(1,2)....` respectively and `a_k = (15, 20), a_i = (25, 30)`, then unit digit of `l-k` is

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