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#!/opt/perl5/bin/perl -w
...
foreach(reverse @lines){ 
       print;                 
}

Global symbol "$line" requires explicit package name at day1_test.1.pl
+ line 5.
Global symbol "$line" requires explicit package name at day1_test.1.pl
+ line 5.
...
Global symbol "$line" requires explicit package name at day1_test.1.pl
+ line 6.
Global symbol "@lines" requires explicit package name at day1_test.1.p
+l line 8.
Execution of day1_test.1.pl aborted due to compilation errors.