pavyfau lujvo

x₁ is a one-time event/occurrence; x₁ does not happen again.

Synonym: nalrapli 'does not repeat'.

jbovlaste

In notes:

nalrapli: x₁ does not repeat/reoccur/recur; x₁ only happens once.
pavyfautci: x₁ is a single-use/one-time tool/utensil/resource/implement used for doing x₂ (and discarded afterward).