IF AM( WILMA )
AND HAS( BOOK ONE )
AND AT_OBJ( 0 )
THEN
  SWAP
END IF

IF AM( WILMA )
AND HAS( BOOK TWO )
AND IS_OBJ( 0, BOOK ONE )
AND AT_OBJ( 1 )
THEN
  EARN( £50 )
  SWAP
END IF

IF AM( WILMA )
AND HAS( BOOK THREE )
AND IS_OBJ( 0, BOOK ONE )
AND IS_OBJ( 1, BOOK TWO )
AND AT_OBJ( 2 )
THEN
  EARN( £100 )
  SWAP_FOR( BOOK THREE )
END IF