ok 1 # 'banana'
ok 2 # 'aa bcbc'
ok 3 # 'abc-abcd'
ok 4 # 'alphabet'
ok 5 # 't/SQL'
ok 6 # 'constitution'
ok 7 # 'electricity'
not ok 8 # function returned non-substring 'ana' for 'bananaannaaaba'
ok 9 # 't/longstring'
ok 10 # 't/debruijn'
ok 11 # 'random'
ok 12 # 'foobfooroobf'
ok 13 # 'aaaa'
ok 14 # 'ababa'
not ok 15 # expected length 3, got length 4 for '11011011'
# a: 1101
# x: 011
ok 16 # '64 As'
ok 17 # 'redinias'
ok 18 # '123123'
ok 19 # '16384 As'
## 17 (71.6543539762497)
