Crossword puzzle clue "cd's ancestor"

Here are the possible solutions for cd's ancestor clue

Answer
Clue
Relevancy
abacus
Clue
Ancestor of the adding machine
Computer ancestor
Calculator's ancestor
Ancestor of a calculator
Definition
(Latin) a counting frame using beads
adam
Clue
Everyone's ancestor
Common ancestor?
Noah ancestor
Everyone's ancestor, ostensibly

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