Draw the mechanism when hinges occur at $A,D,E$ and $F,$ c show that $P=0\mathrm{.}27M_p.$ Carry out equilibrium checks to show that the $BM$ at the other $2$ possible hinge locations is less than the relevant yield moment $($i$.$e$.$ this is the true collapse mechanism$).$ Finally draw the BM diagram at collapse.

$($Answer: Other BMs are $0\mathrm{.}325M_p$ and $0\mathrm{.}975M_p).$