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    \$\begingroup\$ This outputs the last index instead of -1 if no palindrome is found (i.e. aaabb outputs 5 instead of -1). \$\endgroup\$ Commented Aug 21, 2019 at 7:54
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    \$\begingroup\$ @KevinCruijssen: Right you are. I fixed it at the cost of 2 bytes. \$\endgroup\$ Commented Aug 21, 2019 at 15:08