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knoppix@Microknoppix:~$ perl -E '
> open my $inFH, q{<}, \ <<EOD or die qq{open: <<HEREDOC: $!\n};
...
c_2_1_2- + a_123_1_1-
d_83_1_1- + c_2_1_5-d_162_1_1-
knoppix@Microknoppix:~$