velru'e lujvo

x1 is a stage of process with input x2 and output x3 of process x4.

See also ve, pruce.

In notes:

kapyga'ivelru'e
pr4 is the instar (moulting period) of pr2=g1=sk2 that changes skin/outer covering sk1=g2 [with end result pr3 of development pr1]
kulvelru'e
p4 is the grade of student p2 of school p1=c1 at c2 teaching subject c3.