precisely unless

listen to the pronunciation of precisely unless
English - English
implies a negative and is implied by a negative; i.e. B implies not-A and not-B implies A
unlesss

G ≥ H unlesss H ≥ GR or HL ≥ G for some GR ∈ GR or some HL ∈ HL. ¶ (Analogous to “iff”, the term “unlesss” means “unless and only unless”.).