how to //replace with random blocks

[VovaR2D2]

if you do /set 1 2 3 it will make platform with randomly placed dirt grass and stone
I builded complex figure out of wool and now I want to turn it into mix of stone andesite and stonebricks but command /replace wool 1 1:5 98 dont work - it replaces it with only stone.
how do I change blocks figure made of into mix of blocks? using /set will take a lot of time

free plugins
minecraft paid for free
SpigotMC
minecraft plugins
mcmarket
mc-market
spigotmc
free minecraft paid plugins
free minecraft plugins
aac free
ewg free
Minecraft Premium Plugins
ewg free download
litebans free
epicworldgenerator free
free schematics
leaked schematics minecraft
schematics
schematics leaked
schematics free
minecraft schematics free
paid minecraft schematics free
paid minecraft schematics for free
free cracked plugins
free cracked minecraft plugins
plugins
featherboard download
featherboard plugin download
antiaura download
xenforo leaked
xenforo for free
xenforo addons