Help with term 'foll' in Vest Pattern

Hi! I am starting a vest pattern. I am working on the rib at the bottom and this is what I can’t follow:

Cont in rib, dec 1 st at each end of 5th and [B]2 foll 4th rows [/B]79.

I understand the decrease part and that foll means following or follow but I don’t understand it in this context: [I][B]‘2 foll 4th rows’ [/B][/I]mean? I am a bit of a novice and am totally stuck!

Thanks so much.

You break down the parts: following as in after that 5th row, 4th rows is every 4th row, and 2 is how many times. So -

Continue in rib, dec on the 5th, 9th and 13th rows, 79 sts remaining.

Now [B][I]that[/I][/B] makes sense! Big thanks !