/FONT#0=BASL30/FONT#1=BASI30/FONT#2=SUB/FONT#3=NGR40/FONT#4=BDB30
␈↓␈↓↓␈↓α␈↓β␈↓∧␈↓β␈↓ ∧"COMPUTER SCIENCE DEPARTMENT
␈↓ ¬	STANFORD UNIVERSITY

␈↓ ↓H

␈↓ ↓H

␈↓ ↓H
␈↓ ↓⊂CS 206           COMPUTING WITH SYMBOLIC EXPRESSIONS        FALL 1973
␈↓ ¬iFINAL EXAM

␈↓ ↓H
␈↓ ¬!Solutions to Problems
␈↓
␈↓ ↓H
␈↓ α_1. ␈↓↓alt[u,m,n] ← ␈↓∧if n ␈↓↓u ␈↓∧then ␈↓NIL ␈↓∧else if ␈↓↓m=1 ␈↓∧then a ␈↓↓u . alt[␈↓∧d ␈↓↓u,n,n] ␈↓∧else ␈↓↓alt[␈↓∧d ␈↓↓u,m-1,n].
␈↓ ↓H

␈↓ ↓H