A part of the wall that is made to remove (e.g., a Pesach kitchen).
Making or Undoing a Ponytail, Braiding a Doll's Hair or Wig, and Scratching One's Head with Fingernails;
different types of bags on rolls, small packets of sugar, ketchup, etc.; bags that will never completely open;
Understanding the rabbinical restrictions of KOSAIV/MOCHAIK.