supermarket au; Rainbow Bridge World isn’t as big as its name tends to make people believe.   The small grocery shop is packed full with produce, bright packages of snack foods, bottled drinks.   Surprisingly enough, even in their small town, Rainbow Bridge World is often full, people bringing a constant flow of traffic in the mornings and afternoons.   There’s only enough room for four check out lanes in the store.  One an express lane, lined with glass cases