Shape raglan plese

Hi I am fairly new to knitting and am so confused by the instruction . The pattern says: Dec 1 St each end of next and 7 foll 4th rows, then on foll 5 rows. Can anyone help explain this as I really don’t know what rows I should be decreasing on?
Thank you.

Welcome to KnittingHelp!
Call the next row, row 1. The decreases at each end are on rows 1,5,9,13,17,21,25 and 29 then on rows 30,31,32,33 and 34.

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Thank you so much for your help.