shithub: kwa

ref: 10e72d182aad860492f6ec2e80b0c05a4dc20b7a
dir: /test/p.35/

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