Remove all the consonants
Read a Soroban Abacus
Sophie Germain prime
Criss_Cross_000 : Unique elements in a Square array
GJam 2016 Rd1A: Rank and File (Large)
GJam 2017 Kickstart: Parentheses (Small)
Primes for Large N: 2^30, System Memory Limit
QWERTY Shift Code Decoder
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