tests = [
	'1001110011'
	'1110111011'
	'0010010010'
	'1010101010'
	'1111111111'
	'0100101101'
	'0100100'
	'101'
	'11'
	'00'
	'1'
]

F is_repeated(s:Str) (s.len()/2..0).first(F(x) s.starts_with(s[x..null]))

{
	tests.each(F(test) {
		local r = is_repeated(test)
		echo("${test} ${if r "has repetition of length ${r} (i.e. ${test[0..r]})" "is not a rep-string"}")
	})
}