inductive getl (h: nat) (c1: C) (c2: C): Prop \def
| getl_intro: \forall (e: C).((drop h O c1 e) \to ((clear e c2) \to (getl h
inductive getl (h: nat) (c1: C) (c2: C): Prop \def
| getl_intro: \forall (e: C).((drop h O c1 e) \to ((clear e c2) \to (getl h