|math:
<a> ‘=‘ <b> = <b> ‘=‘ <a>
<a> x <b> = <b> x <a>
<a> ‘-‘ <b> = ‘-‘ <b> ‘+’ <a>
<a> ‘+’ <b> = <b> ‘+’ <a>
<a> ‘/‘ <b> = ‘(‘ 1 ‘/‘ <b> ‘)’ x <a>
|english:
| S <= NP [Aux] VP
| NP <= [Art] N [PP]
| VP <= V [{NP,S}]
| PP <= Prep NP
| NP <= [Poss] N
| Poss <= NP Poss-Affix
