def add_scaffold_crossovers(design: sc.Design) -> None:
    for helix in range(1, 23, 2):  # scaffold interior crossovers
        design.add_full_crossover(helix=helix,
                                  helix2=helix + 1,
                                  offset=144,
                                  forward=False)

    for helix in range(0, 23, 2):  # scaffold edges crossovers
        design.add_half_crossover(helix=helix,
                                  helix2=helix + 1,
                                  offset=0,
                                  forward=True)
        design.add_half_crossover(helix=helix,
                                  helix2=helix + 1,
                                  offset=287,
                                  forward=True)
def add_crossovers(design: sc.Design) -> None:
    # staples interior
    for offset in range(84, 1246, 42):
        design.add_full_crossover(helix=0,
                                  helix2=1,
                                  offset=offset,
                                  forward=False)
        design.add_full_crossover(helix=3,
                                  helix2=4,
                                  offset=offset,
                                  forward=True)
    for offset in range(56, 1246, 42):
        design.add_full_crossover(helix=1,
                                  helix2=2,
                                  offset=offset,
                                  forward=True)
        design.add_full_crossover(helix=4,
                                  helix2=5,
                                  offset=offset,
                                  forward=False)
    for offset in range(70, 1246, 42):
        design.add_full_crossover(helix=2,
                                  helix2=3,
                                  offset=offset,
                                  forward=False)
        design.add_full_crossover(helix=5,
                                  helix2=0,
                                  offset=offset,
                                  forward=True)
    for offset in range(49, 1245,
                        42):  # extra crossovers 5 - 0 for some reason
        design.add_full_crossover(helix=5,
                                  helix2=0,
                                  offset=offset,
                                  forward=True)

    # staples edges
    design.add_half_crossover(helix=0, helix2=1, offset=42, forward=False)
    design.add_half_crossover(helix=3, helix2=4, offset=42, forward=True)
    design.add_half_crossover(helix=0, helix2=5, offset=1245, forward=False)
    design.add_half_crossover(helix=2, helix2=3, offset=1245, forward=False)

    # scaffold interior
    for offset in range(58, 1250, 42):
        design.add_full_crossover(helix=0,
                                  helix2=1,
                                  offset=offset,
                                  forward=True)
    for offset in range(30, 1250, 42):
        design.add_full_crossover(helix=1,
                                  helix2=2,
                                  offset=offset,
                                  forward=False)
    for offset in range(54, 1250, 42):
        design.add_full_crossover(helix=2,
                                  helix2=3,
                                  offset=offset,
                                  forward=True)
    for offset in range(26, 1250, 42):
        design.add_full_crossover(helix=3,
                                  helix2=4,
                                  offset=offset,
                                  forward=False)

    # scaffold edges
    design.add_half_crossover(helix=0, helix2=1, offset=16, forward=True)
    design.add_half_crossover(helix=2, helix2=3, offset=12, forward=True)
    design.add_half_crossover(helix=4, helix2=5, offset=19, forward=True)
    design.add_half_crossover(helix=0, helix2=1, offset=1275, forward=True)
    design.add_half_crossover(helix=2, helix2=3, offset=1271, forward=True)
    design.add_half_crossover(helix=4, helix2=5, offset=1278, forward=True)