Which rod farm is not loaded?

Immediately after payment you will receive a link to the zip file with the solution of the problem 4.1.8 (Chapter 1 - statics topic - 4.1: statically determinate and statically indeterminate truss. Unloaded rods) on the theoretical mechanics of collection of short tasks Kep OE, H. A. Viba, OP Grapis, JA Svetinysh and others. Publishing Moscow / Graduate School / 1989, 2009, 2012. The task is made in the format word (typed or hand-written decision in a Word) or in manuscript form in the format gif, packed to the archive zip (open on any PC) .After checking the solutions would be very grateful if you leave your positive feedback.