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@file = map { $$_[0] } 
        sort { $$a[1] <=> $$b[1] }
        map { [$_, (split /:/)[3] ] } @file;

@file = map { join ':', (split /:/)[1,2,3,0] }
        sort
        map { join ':', (split /:/)[3,0,1,2] } @file;