Edge template IV2b

The Edge template IV2b
R4 C5 Sa1 Sb1 Vc1  Se1 Sa2 Vb2 Sa3

Read has two threats:

R4 C5 Sa1 Sb1 Vc1 Vb3 Pa4 Pb4 Se1 Sa2 Vb2 Sa3 and R4 C5 Sa1 Sb1 Vc1 Vd2 Pd1 Pc2 Pe2 Pc3 Pd3 Pe3 Pb4 Pc4 Pd4 Pe4 Se1 Sa2 Vb2 Sa3