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my @a = ([  1,  8],
         [  9, 11],
...
         [ 62, 30],
         [ 92, 12],
         [104, 30]);

my @b = (
    [1,  9, 20, 22, 31, 38, 46, 54, 62, 92, 104],
    [8, 11,  2,  8,  7,  8,  8,  8, 30, 12,  30]
);

my @c = (8, 11,  2,  8,  7,  8,  8,  8, 30, 12,  30);