Help with understanding pattern

Don’t understand how to do the following pattern, please help. It says,
Cast off 6 stitches at beginning of next row, then in every following alternate row twice, AT SAME TIME cast off at neck edge 11 stitches at beginning of following alternate row.

Hi and welcome!
Cast off the 6 sts at the beg of the row and call that row 1.
Row 3 Cast off 3sts at beg of row
Row 5 Cast off 3 sts at beg of row
The cast off of 11sts at the neck edge should be on row 3 but since I suspect the neck edge is at the end of the row, cast off 11sts at the beginning of row 4.

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