Applying the combination principle for closed nets in n+k(k≥4) phase multisystems, the author has derived the complete systems of closed nets of unary six-phase(n+5) multisystems. Every typical closed net involves exclusively eight invariant points. Two topologically distinct configurations of the typical closed nets have been generated from two different ways of combination, and hence, two distinct representation polyhedra have been constructed. On the basis of these configurations or polyhedra, the author has rederived all the 16 basic forms of phase diagrams given by Kujawa et al. Applying the combination principle for closed nets in n + k (k ≧ 4) phase multisystems, the author has derived the complete systems of closed nets of unary six-phase (n + 5) multisystems. Every typical closed net named exclusively eight invariant points Two topologically distinct configurations of the typical closed nets have been generated from two different ways of combination, and hence, two distinct representation polyhedra have been constructed. On the basis of these configurations or polyhedra, the author has rederived all the 16 basic forms of phase diagrams given by Kujawa et al.