Human: Merging a list of lists Assistant: 
Here is some code to create a list containing flattened list `[['A', 'B', 'C'], ['D', 'E', 'F'], ['G', 'H', 'I']]`

values = sum([['A', 'B', 'C'], ['D', 'E', 'F'], ['G', 'H', 'I']], [])

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