0 = ( 1 | E 2 | u 3 | x 4
1 = E 5
2 = ( 6 | [ 7 | b 8 | p 9
3 = E 10
4 = <E -> x> 11
5 = ) 12
6 = ) 13 | E 14
7 = E 15
8 = E 16
9 = <E -> E p> 11
10 = <E -> u E> 11
11 = 1
12 = <E -> ( E ) > 11
13 = <E -> E(E, ..., E)> 11
14 = ) 13 | , 17
15 = ] 18
16 = <E -> E b E> 11
17 = E 14
18 = <E -> E[E]> 11
