for n being Nat
for x being Element of REAL n
for L0, L1, L2 being Element of line_of_REAL n
for P being Element of plane_of_REAL n st L0 c= P & L1 c= P & L2 c= P & x in L0 & x in L1 & x in L2 & L0 _|_ L2 & L1 _|_ L2 holds
L0 = L1