vrabatke lujvo

b1=v1 is a switch/actuating lever on/for item b2, with purpose b3, made of material b4.

Though there has been a great amount of debate in Lojbanistan over the need for a lujvo as such, I thought I would submit it anyway.

In notes:

x1 is a faucet made of material x2 with flow rate x3 and water pressure x4