Cabinet
- Member's benefits
  - Create study meterials
  - Subscribe for quizzes
  - Practice in Flashcards mode
  - Practice in Quiz mode
  - Track your progress and identify weak spots
  - Add explanations
  - Discuss topics with others
  - Create and join study groups
  - Have fun and connect with friends!
  Sign In
  Sign in Register
Discover
- Study materials
- Study groups
Announcements

Violation

koil/o

hollow, concave, depressed

Please describe the matter of abuse