Waxa loo isticmaalaa sida go'doominta-iska-caabbinta qaraxa ee tuubada ama mashruuca fiilooyinka fiilooyinka.
1. Khatar ah: qaybta 1&2 ama aagga 21, 22;
2. jawiga qarxa ama uumiga: fasalka Ⅱ A, ⅡB, Ⅱ C , jawiga boodhka oo ololaya;
3. Gudaha ama dibadda;
4. Heerkulka heerkulka: T1 ~ T6.