Grocery Shopping

Start (assuming you are in store and have a grocery cart)

Identify and number all items on list 1 through n

Search isle for a single item, and bring the cart with you

Is item on list (1 through n)?

Pick up single item, and place it in cart

yes

Leave item on shelf

no

Does cart have n items in it?

no

yes

End (proceed to checkout)

Look for the first isle, and move toward it

Have all items in the isle been examined?

no

Move to the next isle

yes