and he made under the twenty boards forty silver sockets; two sockets under one board for its two tenons (dovetails), and two sockets under another board for its two tenons.

You shall make forty silver sockets under the twenty boards, two sockets under each board for its two dovetails, and two sockets under another board for its two dovetails;

and their forty silver sockets, two sockets under each board.

and their forty silver sockets; two sockets under [the end of] each board.