Central product of D16 and Z4

Definition
This group is defined in the following equivalent ways:


 * 1) It is the central product of defining ingredient::dihedral group:D16 and defining ingredient::cyclic group:Z4, with a common central cyclic group:Z2 identified.
 * 2) It is the central product of defining ingredient::semidihedral group:SD16 and defining ingredient::cyclic group:Z4, with a common central cyclic group:Z2 identified.
 * 3) It is the central product of defining ingredient::generalized quaternion group:Q16 and defining ingredient::cyclic group:Z4, with a common central cyclic group:Z2 identified.