asymtotic = ['asymtotic', '']
asymtotic_modified = ['bound', 'run time', 'growth', 'growth rate']
commonly_modified = ['complexity', 'efficiency', 'growth rate']
-common_modifiers = ['computational', 'big oh', 'algorithmic', 'time',
- 'asymtotic', '']
+common_modifiers = ['computational', 'big oh', 'algorithmic', 'time', 'asymtotic', '']
unmodified = ['big oh', 'order', 'order of complexity', 'time']
O = bnf_expand([asymtotic, asymtotic_modified],
[common_modifiers, commonly_modified], [unmodified])