

Vertical constraints: 1st row (TW0-TW3) can be used for any height of building, but the others (TW4-TW11) are only on building groups that have some part that is at least 8 floors high.

Horizontal splits: First 3 columns can be slit into 4 4th column is never split Roof junk mapping: SW uses JW for sides, JR for tops (eg SW5 will use JW5 and JR5) Tall Walls (eg SW0, which is in the 1st column, is 4 times more likely to be used than SW3, which is in the 4th column) Roof mapping: columns map to similar column in yellow range R0-R3 (eg SW2 and SW6 both use R2) Top row (SW0-SW3) – can split into 2 parts 2nd row (SW4-SW7) – can split into 3 parts
