Human: Sub matrix of a list of lists (without numpy) Assistant: 
Here is some code to create sub matrix of a list of lists `[[2, 3, 4], [2, 3, 4], [2, 3, 4]]` (without numpy)

[[2, 3, 4], [2, 3, 4], [2, 3, 4]]

#Warning: this code generation is experimental. Please inspect the code for any bugs before executing.