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Related to the issue of implementing basic bus (#1497), I have implemented basic bus together with an example (`permutation_via_bus.asm`) as specified inside the issue. Currently, `test_data/std/bus_permutation_via_challenges.asm` works as intended (To make it sound, stage(1) witness columns need to be exposed publicly and verifier needs to check such as `out_z1 + out_z2 = 0`) We can now check using RUST_LOG=trace and adding the final z1 and z2 is equal to 0. However, `test_data/std/bus_permutation_via_challenges_ext.asm` is not working correctly as intended. This will be fixed with the following commits.