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

5. Count the Necklaces

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