Steps intermediate between Gamma-4 (20) and (21)

Steps intermediate between Gamma-4 (20) and (21):

(20) with substitutions; "replica" in red		(20.1)

Deiterate the "replica"		(20.2)

(20.2). R_ngm, R_nbc		(20.3)

Graph (20.3) is the same as graph (21) in the main sequence. Note that the original of (21) in the typed version of this paper contains an error: there is an extraneous alpha cut around the left member of that version of the graph.