Select a suitable independent set / and use part (b) to show that the graph in Fig. 11.81 (known as the Herschel graph) has no Hamilton cycle.

They say the darkest hour is just before the dawn, and caliginous thoughts often swirled through his murky, insomniac mind as he lay awake …

Large companies of them often passed to Burlington from their camping ground a little west of us, and would stop for something to eat, asking first for doughnuts and cow's grease (butter).

Today's crossword is a stinker.