def get_dev_input4() -> list:
    """Build a maze for development purposes."""
    form1 = (
"""oooooo+--+oooooo
o+--+o|oo|o+--+o
o|oo+-+oo+-+oo|o
o++oooooooooo++o
oo+-+o+--+o+-+oo
oooo|o|oo|o|oooo
o+--+o+--+o+--+o
++oooooooooooo++
|oooooooooooooo|
+--------------+
oooooooooooooooo
o+-+oo+--+xx+-+o
++o|oo|oo|oo|o++
|oo+--+oo+--+oo|
|oooooooooooooo|
+--------------+""")

    form2 = form1.splitlines()
    grid = []
    for line in form2:
        grid.append(list(line))
    return grid