Identify each step as initiation, propagation, or termination.

◦ initiation = b; propagation = a, f; termination = c, d, e
◦ initiation = a, f; propagation = c, d, e; termination = b
◦ initiation = b; propagation = a, c, g; termination = d, e, f
◦ initiation = b; propagation = c, d, e; termination = a, f
◦ initiation = c, d, e; propagation = b; termination = a, f