<Li> ISBN 0 - 582 - 53008 - 3 (1996) </Li> <Li> ISBN 1 - 56000 - 520 - 3 (cloth text, 1998, Large Type Edition) </Li> <Li> ISBN 0 - 7910 - 4774 - 1 (hardcover, 1999) </Li> <Li> ISBN 0 - 451 - 52536 - 1 (paperback, 1999) </Li>

When did the pigs learn to read and write