a fortiori
C2CEFR level
90/100Rarity: very rare
TechnicalRegister
By even stronger reasoning, given that a related weaker case already holds.
If a written notice sufficed there, then a fortiori the signed deed suffices here.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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