What are the normal subgroups of the finite Coxeter Groups of type Bn?

Let Bn=ρ0,ρ1,,ρn1 subject to the relations that (ρiρj)mi,j=id with mi,i=1, mi,j=2 for |ij|2, mi,i+1=3 for 0i<n1 and finally mn1,n=4. What are the normal subgroups of Bn and where might I find a reference? Computationally, I see that for all n>4 there are 9 of them and I would like to find some source which describes them explicitly.

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Source : Link , Question Author : Rob Nicolaides , Answer Author : Community

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