I: BEER   = "99"
0: IGNORE = "I"
0: OUTPUT = BEER
0: OUTPUT = " bottles of beer on the wall,"
0: OUTPUT = EOL
0: OUTPUT = BEER
0: OUTPUT = " bottles of beer,"
0: OUTPUT = EOL
0: OUTPUT = "Take one down, pass it around,"
0: OUTPUT = EOL
0: BEER   = PRED BEER
0: OUTPUT = BEER
0: OUTPUT = " bottles of beer on the wall."
0: OUTPUT = EOL
0: OUTPUT = EOL
0: FOO    = BEER
0: CAT    = "|I"
0: IGNORE = FOO