Plan 9 from Bell Labs’s /usr/web/sources/plan9/sys/lib/man/permind/dup2.awk

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Distributed under the MIT License.
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$NF!=lastf2 {if(last2!="") print last2
	 lastf2=lastf1; last2=last1; lastf1=$NF; last1=$0}
$NF==lastf2 {print}
END {print last2; print last1}

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