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#234567890#234567890#234567890#234567890 -p BEGIN{@x{+pop}=()}exists$x{$_}||next
perl -p -e 'BEGIN{@x{+pop}=()}exists$x{$_}||next' FIRST.txt LAST.txt > + MISSING.txt
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5.003 (Camel Book 2nd Edition) 5.6 (Camel Book 3rd Edition) 5.8 (stable version for >5 years) 5.10 (many new features now in common use) 5.16 (Camel Book 4th Edition) 5.18 (hash overhaul) 5.26 (no "." in @INC) 5.36 (subroutine signatures) Dynamic (no standard; code dictates VERSION) Other (discuss in comments)
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