14.1 problem 380
 14.2 problem 381
 14.3 problem 382
 14.4 problem 384
 14.5 problem 385
 14.6 problem 386
 14.7 problem 388
 14.8 problem 389
 14.9 problem 390
 14.10 problem 391
 14.11 problem 392
 14.12 problem 393
 14.13 problem 394
 14.14 problem 395
 14.15 problem 396
 14.16 problem 397
 14.17 problem 398
 14.18 problem 399
 14.19 problem 400
 14.20 problem 401
 14.21 problem 402
 14.22 problem 403
 14.23 problem 404
 14.24 problem 405
 14.25 problem 406
 14.26 problem 407
 14.27 problem 408