"Twinkle, twinkle little bat How I wonder what you're at! Up above the world you fly, Like a tea-tray..." — Lewis Carroll

Oh, 'tis love, 'tis love that makes the world go round.

His answer trickled through my head like water through a sieve.

But I was thinking of a way To multiply by ten, And always, in the answer, get The question back again.

The rule is, jam tomorrow and jam yesterday - but never jam today.