ref: ba4a1c07f1bc7622f8a3dcd4f2d383f4ec70fc1c
dir: /test/t.intest2/
{
line = substr($0, index($0, " "))
print line
n = split(line, x)
x[$0, $1] = $0
print x[$0, $1]
print "<<<"
for (i in x) print i, x[i]
print ">>>"
if (($0,$1) in x)
print "yes"
if ($1 in x)
print "yes"
else
print "no"
}