b= bending bendings are not full just up This is the main structure -----------------------------| -----------------------------| -----------------------------| -9-9-9-9-9-------5-5-5-7-7-7-| -7-7-7-7-7-5-5-5-3-3-3-5-5-5-| -----------7-7-7-------------| Then it goes: ----------------------| ----------7-7b---7-7--|b ----------7-7b---7-7--|b -7-7-7-7-7----7-7-----| -5-5-5-7-7----5-5-----| ----------------------|