Raglan sleeves

Raglan sleeves
What does it mean
Place marker at end of last row (to denote front neck edge - this matches to fasten-off point of Right Front).
For both sleeves
Dec 1 st at marked front neck edge of next 6 rows, ending after 6 [6: 6: 8: 8] rows using F and with a ws row, and at same time dec 1 st at back raglan edge of next and folk 2 alt rows ?
Do I Dec 1 st at each end of first row then continue ?
Thank you nisha

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