Consider the following statements : If a simply supported beam of uniform cross-section is subjected to a clockwise moment at the left support and an equal anticlockwise moment at the right support, then the 1. B.M.D. will be in the shape of a rectangle. 2. S.F.D. will be a straight line coinciding with the base. 3. deflection curve will be in the shape of a circular arc. Of these statements :

Consider the following systems : 1. Trusses and purlins 2. Suspension system 3. Flat grid roof 4. Shells When these are used in single deck industrial structures, the correct sequence in increasing order of spans will be