The one-number-per-letter system means that your fingers quickly discover interestingly-numbered words; for example:
about 22688
black 25225
carry 22779
dress 37377
fence 33623
field 34353
going 46464
light 54448
money 66639
offer 63337
press 77377
shown 74696
shows 74697
whose 94673
women 96636