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import itertools
import cocotb
from cocotb.triggers import Timer
@cocotb.test()
def test_and3(dut):
for c, b, a in itertools.product((False, True), repeat=3):
dut.a = a
dut.b = b
dut.c = c
yield Timer(1, units='ns')
z = a & b & c
assert z == dut.z