Pattern question, alt rows

[KPetersen]

Hello,

I know there are many posts explaning this type of pattern but as they don't include the same reps as mine I get all confused.

I am shaping the upper part of my sleeve and I am to do the decreases to finish it.

I currently have 32 sts.

The pattern then reads:

dec 1 st at each end of the next and foll alt row, then on 4 foll 4th rows. (20 sts.)

I get so confused with this and none of my knitting books explain how to read the abbreviations. I know alt means every other row but it still doesn't make sense to me. I have broken it down to try to understand better. Is this correct?

R1: dec each end
R2: normal pattern
R3: dec each end
R4: normal patter
R5: dec each end
R6: normal pattern
R7: dec each end
and then again on row 11?

Thank you very much for your help.