| 153 |      1 | 
 | 
|  |      2 | 
 | 
|  |      3 | 
 | 
| 221 |      4 | assert(simp(ZERO | ONE) == ONE)
 | 
|  |      5 | assert(simp(STAR(ZERO | ONE)) == STAR(ZERO | ONE))
 | 
|  |      6 | assert(simp(ONE ~ (ONE ~ (ONE ~ CHAR('a')))) == CHAR('a'))
 | 
|  |      7 | assert(simp(ONE ~ (ONE ~ (ONE ~ ZERO))) == ZERO)
 | 
|  |      8 | assert(simp(ALT(ONE ~ (ONE ~ (ONE ~ ZERO)), CHAR('a'))) == CHAR('a'))
 | 
|  |      9 | assert(simp(CHAR('a') | CHAR('a')) == CHAR('a'))
 | 
|  |     10 | assert(simp(ONE | CHAR('a')) == (ONE | CHAR('a')))
 | 
|  |     11 | assert(simp(ALT((CHAR('a') | ZERO) ~ ONE,
 | 
|  |     12 |                ((ONE | CHAR('b')) | CHAR('c')) ~ (CHAR('d') ~ ZERO))) == CHAR('a'))
 | 
| 153 |     13 | 
 |