Making a "ROSHIM" (mark) on paper, on a page in a sefer.
ודבר דבר (Dabair Davar): Is One Allowed to Talk About Other Things That Are Not Allowed on Other ימים טובים (Yamim Tovim), for Example,...
(Squeezing materials.) understanding the concept of squeezing out human hair, toothbrushes, baby bottle, etc.;