Look at the dots. Are there an even or odd number of dots?
https://talkandcomment.com/p/930aea32b1c8bdd33dbe01bc
even
odd
https://talkandcomment.com/p/e045bbbbe317ded9c0350eef (voice note)
6 + 4 = 10
5 + 5 = 10
4 + 4 + 2 = 10
4 + 5 + 1 = 10