I was trying to learn burnside lemma and now i feel it's one of the very rare topic in competitive programming.

Here are some resources i found very useful:

1. math.stackexchange

2. petr's blog

3. imomath

4. Hackerrank Blog

Here are some problems related to burnside lemma:

1. Necklace

2. Necklace of Beads

3. The Beautiful Board

4. Lucy and the Flowers

Is there some other good resources or problems related to burnside lemma? Please suggest some more.