test_triefind
hello
['he', 'hello']
[('he', 0, 2), ('hello', 0, 5), ('wor', 6, 9)]
[('hello', 0, 5)]
[('he', 0, 2), ('hello', 0, 5), ('wor', 6, 9), ('world', 6, 11)]
[('hello', 0, 5), ('world', 6, 11)]