deepen *10

Hi everyone !
i want to duplicate a simple list of 81 numbers into 10 groups to create a 10*81 list.
The very basic trick i use is the "build list node" where i plug 10 times the same output and add a "transpose" after.
The result is OK ...but i hope there is a better and more elegant" way to do this ?
Because in this case i only need 10 replications ... but if i had needed 1000 of them !?

Thanks