[Gretl-users] list question

Dear List-members, I have a really simple question. I want to compress my small code below: list ylist = 10 13 16 19 loop foreach i ylist series ln2_$i = ln(ylist.$i*GERD95) endloop list ylist = 11 14 17 20 loop foreach i ylist series ln2_$i = ln(ylist.$i*GERD97) endloop list ylist = 12 15 18 21 loop foreach i ylist series ln2_$i = ln(ylist.$i*GERD99) endloop How is it possible to make mylist dynamic in the sense i can add +1 to the ID's in it. By the way, with GERDXX the case is pretty the same. Thanks: Daniel