Raglan Jersey called Paintbox Cardigan

For back of Jersey shape raglan. Instruction says Dec 1 st at each end of next and 8 foll. 4th rows then on fill 12 alt. Rows.

Not sure what it means can you please explain.

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Decrease at each end of the next row (row 1) and then every 4th row until you’ve decreased on 8 following rows. So you would dec on rows 1,5,9,13,17,21,25, 29 and 32.
The 12 following alternate rows would be every other row 12 times: rows 34,36,38,40 etc.

Thank you so much for your help. Most appreciated.

Nice looking sweater!