ing a pattern A1 of FIG. 15 (8) in detail;FIG. 17 is a timing chart for explaining the pattern A1 of FIG. 15 (8) in detail;FIG. 18 is a timing chart for explaining a pattern B1 of FIG. 15 (8) in detail;FIG. 19 is a timing chart for explaining the pattern B1 of FIG. 15 (8) in detail;FIG. 20 is a timing chart for explaining a pattern Cl of FIG. 15 (8) in detail;FIG. 21 is a timing chart for explaini