@Amitava: I think test cases 4 and 6 are incorrect. Could you please verify the same?
@Amitava: please ignore my previous comment. Cheers.
Neighbors are more than adjacents. The first and last elements are considered adjacent. Thus [ABAABA] is not a spindrome as it becomes ...AABAABAA...
However [ABA] is a spindrome even though it also becomes ...AABAABAA...
Sums with Excluded Digits
Project Euler: Problem 2, Sum of even Fibonacci
sum of non-primes
An asteroid and a spacecraft
Surface Fit z(x,y)
swap sign sum & multiply castles
letter yes yes & letter no no
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