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#! perl -sw
use strict;
...
    select undef, undef, undef, .5;
}

C:\test>^Croundrobin
26abcdefghijklmnopqrstuvwxyz
...
 q p u j a k<w>l o r k g m x t q d c m n p b l f y o n j v b b l g
 q p u j a k w<l>o r k g m x t q d c m n p b l f y o n j v b b l g
 q p u j a k w l<o>r k g m x t q d c m n p b l f y o n j v b b l g