greycat 1287607959 learn bar greycat 1287608209 forget greycat 1287608212 learn not bar greycat 1293653208 forget greycat 1293653231 learn A placeholder word, used as a variable name or data in examples. See http://www.catb.org/jargon/html/F/foo.html greycat 1528460791 forget greycat 1528460795 learn #redirect foobar