Sanrio Collectible Cards

There are 2 set. Each set has 36 regular cards, 21 SR, 12 SSR, 12 CR, 9 UR, 9 LR, 9 SP, 6 EX, 12 RTC, and 6 MR. I have no real idea what any of this means other than there are a lot of different cards and variations. 

Each pack contains 3 random cards.