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use v6;
print join ' ', reverse .words for
...
         .map({ [+<<.words[*-1, 0], $_]})\
         .sort\
         .map(*[2])

use v6;

...
==> my @lines;

print ~.words.reverse for @lines;

class Line {
    has $.str handles 'words';
...


print lines().map({Line.new(str => $_)}).grep(/SRC1/).sort;