Please show the code you are using now, so that we can suggest how to change it.

In general one can weed out duplicates by tracking printed items in a hash, but maybe that isn't necessary - hard to tell without seeing actual code, more input examples and desired output.

Perl 6 - second systems done right

In reply to Re: print statement to avoid printing aline more than once by moritz
in thread print statement to avoid printing aline more than once by Anonymous Monk

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