"hellohello"
"hello hello"
5
['h', 'e', 'l', 'l', 'o']
['α', 'β']
[]
['α', 'β', 'γ']
[]
['α']
['β', 'α']
['β', 'γ']
['α', 'β']
"αβa"
"α α-"
'A'
"aβγ"
"abγ"
"abc"
"cbγ"
"0bc"
"01c"
"012"
"21c"
"λbc"
"abc-bc"
"abc"
"a\x00bb"
4
"abc-ab"
"abc"
ff
tt
ff
ff
tt
tt
ff
"αβabc"
"αabcβ"
"αβabcαdeβ"
"adef"
"abef"
"aef"
"aba"
ff
tt
tt
ff