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Answers and rating deltas for

In Perl, how can I join an input line with the next one only if the first one ends with a colon?

Author Votes Δ
tchrist 1 +0.33
Sinan Ünür 1 +0.37
Bill Ruppert 1 +2.02
Marcelo Cantos 1 +0.24
Joel Berger 0 -0.90
aartist 0 -2.36
Last visited: Sep 14, 2014, 5:07:29 AM