shithub: kwa

ref: 6d0ade9e0f10517872304e94c2c5d0e3a14c426d
dir: /test/p.35/

BEGIN			{ FS = OFS = "\t" }
$4 ~ /^North America$/	{ $4 = "NA" }
$4 ~ /^South America$/	{ $4 = "SA" }
			{ print }