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# infix operators: ==, or, and
# grouping: ()
...
# expr := term /and/ term
#         | term /or/ term
#         | term /==/ term

# infix operators: ==, or, and
# grouping: ()
...
# expr := term /and/ term    {print 'and,' . $term1 . ',' . $term2}
#         | term /or/ term   {print 'or,' . $term1 . ',' . $term2}
#         | term /==/ term   {print '==,' . $term1 . ',' . $term2}