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use List::MoreUtils qw/pairwise/; @a = (1..5); @b = (6..10); ... print join ", ", @x; __END__ 6, 14, 24, 36, 50
use List::MoreUtils qw/pairwise/; @a = (1..5); ... print join ", ", @x; __END__ 6, 14, 24, 0, 0