How are doubles falling between 61 through 99 (66, 77, 88, and 99) produced?

Question

With a standard fingerspelling direction and palm orientation
With a reverse fingerspelling direction across the signing space.
With a standard fingerspelling direction, but downward palm orientation.
With a standard fingerspelling direction, but upward palm orientation.

Answer 1

Doubles falling between 61 through 99 (66, 77, 88, and 99) are produced using a standard fingerspelling direction and palm orientation.