alternatives ::= equiAlt +/ (ws ">" ws)
equiAlt ::= conjuncts +/ (ws "|" ws)
-sequence ::= es
- > es ws ^"/" e
-es ::= e */ (w**)
+sequence ::= e */ (w**)
+ > e */ (w**) ws ^"/" e
ss ::= es => "seq" | es ^"/" e /ws
| rewrite ^"&" e*/ws /ws
| rewrite ^"&~" e*/ws /ws
-rewrite ::= sequence /ws => "rewrite"
+rewrite ::= sequence /ws => "rewrite"
| sequence ^"=>" (word|quoted) /ws
ec ::= [~\-\]\\\~]