python - Construct an example where the KMP algorithm has to backtrack multiple times -

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i'm trying construct example kmp algorithm computelpsarray phase have backtrack (see comment below) multiple times (cell in lps array).

e.g. 'aaacaaa' visits backtrack section twice i = 3 , once i = 7

can me construct string visit backtrack section 3-4 times i?

def computelpsarray(pat, m, lps):     len = 0 # length of previous longest prefix suffix     lps[0]=0 # lps[0] 0     = 1     while < m:     if pat[i]==pat[len]:         len+=1         lps[i] = len         i+=1     else:         if len!=0:             # backtrack section - when here 3-4 times same i???              len = lps[len-1]              else:             lps[i] = 0             i+=1

with 'aaaacaa' visits backtrack section 3 times i = 4.

with 'aaaaaca' visits backtrack section 4 times i = 5.


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