Can you describe the bug using a simpler example, maybe as a new SoPW node? I'm not sure I understand - please include the expected output, too.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re^2: improving speed in ngrams algorithm (updated) by choroba
in thread improving speed in ngrams algorithm by IB2017

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