<prompt> Kutokana na kamba mbili, kupata na kurudi mrefu zaidi kawaida substring.str1 abcdef str2 abcxyz  <response>: The longest common substring of the strings abcdef and abcxyz is abc.To find this, we can use dynamic programming to keep track of the length of the longest common substring ending at each position in both strings. Heres one way to do it:def longest_common_substringstr1, str2: m, n lenstr1, lenstr2 dp 0 n 1 for _ in rangem 1 max_len, end_idx 0, 0 for i in range1, m 1: for j in range1, n 1: if str1i - 1 str2j - 1: dpij dpi - 1j - 1 1 if dpij max_len: max_len dpij end_idx i - 1 return str1end_idx - max_len 1: end_idx 1 longest_common_substringabcdef, abcxyzThis code returns abc which is the longest common substring between the two strings. 