circuit to test practical siduation
...................................\CI1+2DFF+4INV+INV+NOR2.asc
...................................\CI1+2DFF+4INV+INV+MUX2.asc
...................................\CI1+2DFF+4INV+INV+NOR3.asc
...................................\CI1+2DFF+4INV+INV+NOR4.asc
...................................\CI1+2DFF+4INV+BUF.asc
...................................\CI1+2DFF+4INV.asc
...................................\CI1+2DFF+4INV+INV+NOR2pin1.asc
...................................\CI1+2DFF+4INV+INV+NAND2.asc
...................................\CI1+2DFF+4INV+INV+XOR2.asc
...................................\CI1+2DFF+4INV+INV+XNR2.asc
...................................\CI1+2DFF+4INV+INV+NAND3.asc
...................................\CI1+2DFF+4INV+INV+NAND4.asc
delay test
..........\delay_test_nand2.asc
..........\delay_test_buf.asc
..........\delay_test_xnr22.asc
..........\delay_test_dff.asc
..........\delay_test_nand4.asc
..........\delay_test_nand3.asc
..........\delay_test_xnr2.asc
..........\delay_test_nor2.asc
..........\delay_test_inv.asc
..........\delay_test_xor.asc
..........\delay_test_mux.asc
..........\delay_test_nor3.asc
..........\delay_test_nor4.asc
final circuit.asc