premises
#th_5c4_09

point(1)
point(2)
point(3)
~eq_point(1, 2)
line(4)
inc_po_l(1, 4)
inc_po_l(2, 4)
~eq_point(2, 3)
eq_point(3, 1)
inc_po_l(3, 4)

conclusions

col(1, 2, 3)

