In several doucments the word Simplicitas is used.
EG in the frase Sancta Simplicitas (Holy simplicity) as supposed to be said by John Huss as he was burned at the stake.
Quid est.
Hic est.
and in latin is "sed"
"Sum me." sum ego is correct (the objective pronoun me is not to be used as a predicate nominative).
The word "of" is included in the genitive case for nouns.
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