D21p=
{{
Prep[{{15,17},{5,12},{13,14},{8,18},
	{3,11},{7,2},{16,20}},21],
Prep[{{16,18},{6,13},{14,15},{9,19},
	{4,12},{8,3},{17,0}},21],
Prep[{{1,8},{2,16},{4,11},{5,19},
	{7,14},{10,17},{13,20}},21]
},{
Prep[{{0,1},{4,17},{7,12},{9,16},
	{10,20},{11,13},{15,19}},21],
Prep[{{0,20},{3,16},{6,11},{8,15},
	{9,19},{10,12},{14,18}},21],
Prep[{{1,8},{2,16},{4,11},{5,19},
	{7,14},{10,17},{13,20}},21]
}};

D21q=DrumLeft[D21p];
D21r=DrumRight[D21q];
D21s=DrumLeft[D21r];
D21t=DrumLeft[D21q];
D21u=DrumLeft[D21t];
D21v=DrumLeft[D21u];
D21w=DrumRight[D21u];
D21x=DrumRight[D21w];

AllD21={D21p,D21q(*,D21r*),D21s,D21t,D21u,D21v,D21w,D21x};

ShowDrumPair[D21p];

ShowDrumPair[D21p,90,60,30];

ShowDrumPair[D21q];

ShowDrumPair[D21s];

ShowDrumPair[D21t];

ShowDrumPair[D21u];

ShowDrumPair[D21v];

ShowDrumPair[D21w];

ShowDrumPair[D21x];