fof(goal, conjecture,(![A,B,C,O,L]:((point(A)&point(B)&point(C)&point(O)&line(L)&inc_po_l(A,L)&inc_po_l(B,L)&inc_po_l(C,L)&inc_po_l(O,L)&bet(A,O,B)&bet(A,O,C))=>(nbet(B,O,C))))).
