12 Days of Christmas
16th
99 Bottles of Beer
15th
Abundant Numbers
35th
Christmas Trees
69th
CSS Colors
19th4th
Divisors
68th
Emojify
Evil Numbers
62nd
Fibonacci
171st
Fizz Buzz
157th
Leap Years
93rd
Morse Encoder
26th
Niven Numbers
82nd
Odious Numbers
49th
Ordinal Numbers
34th
Pangram Grep
13th
Tongue-twisters
44th
United States