free_blocks = [0, 1, 2, 3, 4, 5]

request_a = free_blocks[:3]
free_blocks = free_blocks[3:]

request_b = free_blocks[:2]
free_blocks = free_blocks[2:]

free_blocks.extend(request_a)
free_after_a = free_blocks.copy()
request_c = free_blocks[:2]
free_blocks = free_blocks[2:]

print("request A blocks:", request_a)
print("request B blocks:", request_b)
print("free after A finishes:", free_after_a)
print("request C blocks:", request_c)

# Output:
"""
request A blocks: [0, 1, 2]
request B blocks: [3, 4]
free after A finishes: [5, 0, 1, 2]
request C blocks: [5, 0]
"""