i can't run this script plz help meeeeeee

RouterOS Scripting
1

hi all

i want to run this script

/ppp profile set pppoe-profile rate-limit=40k/64k 128k/256k 16k/32k

but it didn’t work, i think the problem with (40k/64k 128k/256k 16k/32k)
i don’t know how to write script

plz help me

2 
/ppp profile set pppoe-profile rate-limit="40k/64k 128k/256k 16k/32k"
3

thanks man