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http//canada.michaels.com/on/demandware.store/Sites-MichaelsCanada-Site/en_CA/Product-Show?pid=C_82853

I don’t really understand this part of the pattern: “These 2 rows form pat. Cable Panels are now in position. Cont in pat, keeping cont of Cable Panels until work from beg measures approx. 56½” [143.5 cm], ending on a 1st row of Cable Panel A and B."

Welcome to KH!
The first two rows are repeated for the pattern. As you repeat rows 1 and 2 you’ll also work the cable panels. On row 3 you’ll repeat row 1 directions with row 3 of cable panel A or B. On row 4 follow the row 2 instructions with row 4 of cable panel A or B at the appropriate place.
Continue like this and when you reach the last row of the cable panels, row 8, start the cable panels over at cable panels row 1.