//1+gcd(p-1,3)+(1/2)gcd(p-1,4) algebras
<a,b|pa-bab,pb-baaa,class=4>6.408
<a,b|pa-bab,pb-wbaaa,class=4>(p=1 mod 3)6.409
<a,b|pa-bab,pb-w^2baaa,class=4>(p=1 mod 3)6.410
<a,b|pa-bab,pb,class=4>6.411
<a,b|pa-bab-baaa,pb,class=4>6.412
<a,b|pa-bab-wbaaa,pb,class=4>(p=1 mod 4)6.413
