zilcmi lujvo

x1 is a set.

In notes:

mojyzilcmi
z1=m2 [set] are the memories m1 has about subject m3.
vlamojyzilcmi
x1=z1=m2 [set] is the vocabulary remembered/used/retrievable by x2=m1 about subject x3=m3; x1 are the words x2 can recall about x3.