HmDn=Z(m=0)or0(m>0)
HmS0=Z+Z(m=0)or0(m>0)
0->H0Sn->H0Dn+H0Dn->H0Sn-1->H1Sn->H1Dn+H1Dn->H1Sn-1->H2Sn->
n=1
0->Z->Z+Z->Z+Z->H1S1->0->0->H2S1->0->0->H3S1->0->0
HmS1=Z(m=0,1)or0(m>1)
n>1
0->Z->Z+Z->Z->H1Sn->0->H1Sn-1->H2Sn->0->H2Sn-1->H3Sn->0->
H1Sn=0
Hm-1Sn-1=HmSn(m>1)