4 words for AC 1–2 letters

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1 letter (2)

a c
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2 letters (2)

ac ca
Archaic object pronoun
?
T
?
H
?
E
?
E
Hint 1 meaning
The objective case of thou. See Thou.
Hint 2 anagram
ETEH
Hint 3 another clue
BEING USED OR WORKED FOR THE FIRST TIME
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