There is stringency to [the rite of] leaning over [the rite of] waving, and stringency to [the rite of] waving over [the rite of] leaning. One may perform waving on behalf of all the fellow [owners] but one may not lean on behalf of all the fellow [owners]. The stringency of waving [is] that waving applies [both] to individual and communal offerings; while living and when slaughtered; with living matter and with non-living matter; which is not the case with leaning.