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@AofLines = ( 'this is line one', 'this is line two' );;

...

print +( split ' ', $AofLines[ 1 ] )[ 3 ];;
two

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@AofAofWords = ( [ qw[this is line one] ], [ qw[this is line two] ] );
+;

...
print join ' ', @{ $AofAofWords[ 1 ] };;
this is line two