If ``r'' is entered at #27.6, a decimal equivalent range of aspiring pre-images will be automatically set between two selected values (the maximum decimal equivalent that can be set is 232-1). The following sequence of prompts is presented to set the start and end decimal equivalents, and the ``step'' or increment size (default 1),
range of pre-images (default 1-10, max 1024), start: end: step: (example for n=10)