These katas must be solved, they increase in complexity.
- https://www.codewars.com/kata/5556282156230d0e5e000089
- https://www.codewars.com/kata/57a0556c7cb1f31ab3000ad7
- https://www.codewars.com/kata/5556282156230d0e5e000089
- https://www.codewars.com/kata/57a0556c7cb1f31ab3000ad7
- https://www.codewars.com/kata/551f37452ff852b7bd000139
- https://www.codewars.com/kata/57a429e253ba3381850000fb
- https://www.codewars.com/kata/55c45be3b2079eccff00010f
- https://www.codewars.com/kata/57e76bc428d6fbc2d500036d
- https://www.codewars.com/kata/55f8a9c06c018a0d6e000132
- https://www.codewars.com/kata/582cb0224e56e068d800003c
- https://www.codewars.com/kata/515e271a311df0350d00000f
- https://www.codewars.com/kata/523f5d21c841566fde000009
- https://www.codewars.com/kata/55b75fcf67e558d3750000a3
- https://www.codewars.com/kata/55c1d030da313ed05100005d
- https://www.codewars.com/kata/5a03af9606d5b65ff7000009
- https://www.codewars.com/kata/5a35f08b9e5f4923790010dc - Learn Numpy before this