T1E1T1R1A1H4E1D2R1O1N1S1
16 points
TETRAHEDRONS is validvalid
TETRAHEDRON, a polyhedron with four sides [n]
TETRAHEDRON, a polyhedron that has four faces [n]
TETRAHEDRON, a polyhedron with four sides [n]
TETRAHEDRON, a polyhedron that has four faces [n]