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def max(a,b):
if a>b: return a
return b
def keep(last, current, inp, map):
# print last
# print current
# print map
if len(inp) == 2 :
if inp[0]==inp[1]: return 1
return 2
if current >= len(inp):
return len(map)
if current == last :
map11 = map.copy()
map11.add(inp[current:])
return keep(last, current + 1, inp, map11)
map1 = map.copy();
if current != (len(inp)-1):
map1.add(inp[last:current])
map2 = map.copy()
return max(keep(last,current+1,inp, map2), keep(current, current+1, inp, map1))
print(keep(0,0,"121", set([])))
print(keep(0,0,"aaaaaaa", set([])))
print(keep(0,0,"aba", set([])))
print(keep(0,0,"aababaa", set([])))
print(keep(0,0,"21", set([])))
print(keep(0,0,"22", set([])))
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