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160. Fig. 56 Fig. 54 Fig.55 '50 51 540 0) 550 551 54( Fig. 57 DIAGRAM ' INITIAL MATERIALS <<{— | NUCLEAR SOURCE(S) >> INITIAL INITIAL MATERIALS STAGE pee een eens INITIAL MATERIALS t <— =; NUCLEAR SOURCE(S) > NEW MATERIALS SECOND STAGE NEW MATERIALS pee ' INITIAL MATERIALS ' <— _} NUCLEAR SOURCE(S) y > INTERACTIONS SC NEW MATERIALS ft NEW NUCLEAR SOURCES) Aa THIRD STAGE NEW MATERIALS