hello world this is hello world. hello world repeats three times in this string!

[(' ', 13),
 ('l', 9),
 ('e', 8),
 ('o', 6),
 ('h', 6),
 ('r', 6),
 ('s', 6),
 ('t', 6),
 ('i', 6),
 ('s ', 5),
 (' t', 4),
 ('ello ', 3),
 ('worl', 3),
 ('llo worl', 3),
 ('rl', 3),
 ('is ', 3),
 ('hello w', 3),
 (' wor', 3),
 ('wo', 3),
 ('lo wo', 3),
 ('is', 3),
 ('hello wor', 3),
 ('ello', 3),
 ('ell', 3),
 ('ello wor', 3),
 ('llo world', 3),
 ('lo w', 3),
 ('llo', 3),
 ('lo worl', 3),
 ('lo world', 3),
 ('el', 3),
 ('rld', 3),
 ('lo wor', 3),
 ('orl', 3),
 ('o worl', 3),
 ('llo ', 3),
 ('hello world', 3),
 ('llo wo', 3),
 ('world', 3),
 ('o ', 3),
 ('or', 3),
 ('hel', 3),
 ('lo ', 3),
 ('th', 3),
 ('llo wor', 3),
 ('o w', 3),
 ('hell', 3),
 ('w', 3),
 ('hello wo', 3),
 ('ello worl', 3),
 ('o world', 3),
 ('wor', 3),
 (' th', 3),
 ('hello ', 3),
 (' worl', 3),
 ('d', 3),
 ('orld', 3),
 ('llo w', 3),
 ('hello', 3),
 (' w', 3),
 ('ello wo', 3),
 ('ld', 3),
 ('lo', 3),
 ('ll', 3),
 (' world', 3),
 ('ello world', 3),
 ('he', 3),
 ('ello w', 3),
 (' wo', 3),
 ('o wor', 3),
 ('hello worl', 3),
 ('o wo', 3),
 ('d ', 2),
 (' this', 2),
 ('o world ', 2),
 ('n', 2),
 ('in', 2),
 (' hello world', 2),
 ('thi', 2),
 ('rld ', 2),
 (' hell', 2),
 (' hello wor', 2),
 ('orld ', 2),
 (' this ', 2),
 (' hel', 2),
 ('his ', 2),
 (' hello worl', 2),
 ('re', 2),
 (' hello wo', 2),
 (' hello ', 2),
 ('lo world ', 2),
 ('hello world ', 2),
 ('his', 2),
 (' world ', 2),
 ('ld ', 2),
 (' h', 2),
 (' i', 2),
 ('this', 2),
 ('llo world ', 2),
 ('ello world ', 2)]