git: 9front

ref: f1400cfe8d0fc3dc0753d7f2b171a9df94c8ebfb
dir: /sys/src/cmd/dict/rev.awk/

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NF == 2	{
		printf "%s\t%s\n", $2, $1
	}
NF != 2 {
		print "ERROR " $0
	}