You need to sort by start address. You're lucky that your input data was already sorted by such.
Also, you have to look for $rs <= $ce + 1 rather than $rs == $ce + 1, or you end up not coalescing things like 0-7 (0.0/3), 4-7 (4.0/2), which should just get swallowed.
-- Randal L. Schwartz, Perl hacker
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