fg_01_07.vhd	entity reg4

fg_01_08.vhd	architecture behav of reg4

tb_01_01.vhd	entity test_bench_01_01
		architecture test_reg4_behav of test_bench_01_01

fg_01_10.vhd	entity d_latch
		entity and2
		architecture basic of d_latch
		architecture basic of and2

fg_01_11.vhd	architecture struct of reg4

tb_01_02.vhd	entity test_bench_01_02
		architecture test_reg4_struct of test_bench_01_02

tb_01_03.vhd	entity shift_adder
		architecture behavior of shift_adder
		entity reg
		architecture behavior of reg
		entity shift_reg
		architecture behavior of shift_reg

fg_01_12.vhd	entity multiplier
		architecture mixed of multiplier

fg_01_13.vhd	entity test_bench
		architecture reg4_test of test_bench