instead of; in place of; as a substitute for; in exchange for; in return for; to make up for
instead; but (on the other hand)
another helping; second helping; seconds; command to have dog place its second paw in one's hand
substitution; replacement; shifting; change
alternating; taking turns
to relieve each other; to take turns (to do)
alternately; in turn; one after the other
another helping; second helping; seconds; command to have dog place its second paw in one's hand
substitute actor; stand-in; double