# Count Down with 7-Segment-Display with common Anonde 9 -> 0
#     a
# f |---| b
#    -g-
# e |---| c
#     d
#
# a = 1, b = 2, c = 3, d = 4, e = 5, f = 6, g = 7

# Start (9)
light [4,5] off
light [1,2,3,6,7] on
wait 1

# (8)
light [1,2,3,4,5,6,7] on
wait 1

# (7)
light [4,5,6,7] off
light [1,2,3] on
wait 1

# (6)
light [1,2] off
light [3,4,5,6,7] on
wait 1

# (5)
light [2,5] off
light [1,3,4,6,7] on
wait 1

# (4)
light [1,4,5] off
light [2,3,6,7] on
wait 1

# (3)
light [5,6] off
light [1,2,3,4,7] on
wait 1

# (2)
light [3,6] off
light [1,2,4,5,7] on
wait 1

# (1)
light [1,4,5,6,7] off
light [2,3] on
wait 1

# (0)
light [7] off
light [1,2,3,4,5,6] on
wait 1

stop
# repeat