How to replace random blocks with a different type of block

I have a student who has a room filled with one type of blocks making the walls. He wants to use the code builder to replace SOME of the

Create a Simple Model - MATLAB & Simulink

Minecraft Commands: 12 Cool Cheats - Create & Learn

Procedures

Importing STEP files to Rhino creates a new block - Rhino - McNeel

Stop Robotexts: How to Block Smishing and Spam Text Messages

MCEdit Filter: Random Blocks 2 Minecraft Mod

Developing programs with repetition - Issuu

Pen Makeblock Education

MVRDV Diagram with Rhino + Photoshop