17. with two matching projections, so that the frames can be joined together. All the frames are to have these projections.
18. Make twenty frames for the south side
19. and forty silver bases to go under them, two bases under each frame to hold its two projections.
20. Make twenty frames for the north side of the Tent
21. and forty silver bases, two under each frame.
22. For the back of the Tent on the west, make six frames,