This generation is quite straight forward, with what is probably a single mold comprising of 2x2, 2x3 and 2x4-bricks. There are one special thing to notice - represented by the b-mold: Mold-position 1 of the b-mold matches mold-position 1 of the a-mold, with the top rotated 180 deg. No 1x2-bricks appear to exist as part of this mold/mold-generation. The different 1x2-bricks with wide centered pip all have inside ribs, while these bricks are all without such ribs.