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      1 BEGIN { FS = ":" }
      2 {	if (a) print "a", a
      3 	if (b == 0) print "b", b
      4 	if ( c == "0") print "c", c
      5 	if (d == "") print "d", d
      6 	if (e == 1-1) print "e", e
      7 }
      8 $1 == 0	{print "$1 = 0"}
      9 $1 == "0"	{print "$1 = quoted 0"}
     10 $1 == ""	{print "$1 = null string"}
     11 $5 == 0	{print "$5 = 0"}
     12 $5 == "0"	{print "$5 = quoted 0"}
     13 $5 == ""	{print "$5 = null string"}
     14 $1 == $3 {print "$1 = $3"}
     15 $5 == $6 {print "$5 = $6"}
     16