Programs from Chapter 2 include:

o hanoi.p		This is Program 2.1, p. 62
o sillysort.p		This is Program 2.2, p. 85
o nqueens_skel.p	This is Program 2.3, p. 110
o nqueens_ineff.p	This is Program 2.4, p. 112
o nqueens_eff_rec.p	This is Program 2.5, p. 115
o nqueens_eff_nonrec.p	This is Program 2.6, p. 116
o findmax.p		This is the code of Exercise 2.30, p. 125
o stuff.p		This is the code of Exercise 2.31, p. 126
o trial.p		This is the code of Exercise 2.32, p. 126
