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RosettaCodeData/Task/Variable-length-quantity/J/variable-length-quantity-1.j

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N=: 128x
v2i=: (N&| N&#./.~ [: +/\ _1 |. N&>)@i.~&a.
i2v=: a. {~ [:;}.@(N+//.@,:N&#.inv)&.>
ifv=: v2i :. i2v
vfi=: i2v :. v2i
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