How many narrative strands in regeneration by pat barker?

In "Regeneration" by Pat Barker, there are primarily three narrative strands. The first focuses on the experiences of soldiers in World War I, particularly the psychological impacts of war. The second strand explores the relationship between the soldiers and Dr. Rivers, a psychiatrist treating them. The third strand delves into the lives of the soldiers before the war, highlighting their backgrounds and motivations. Together, these strands provide a multifaceted view of the effects of war on individuals and society.