context: Jam is located at picnic. Demonstration is located at class. Sign is located at demonstration. Sign cannot have a location of chicken. Projectile ball cannot have a location of town. Class cannot have a location of chicken. Demonstration is involved with explain. School is located at town. Class is located at school. Projectile ball cannot have a location of picnic. Sign cannot have a location of all ocean of world.
text: Class cannot have a location of town.