# Add two numbers, according the the Boolos, et al., conventions.  

# Erase a one and move to the right (state 0).  If the first square is
# blank, move to the right and halt (state 1).  Else, keep moving to
# the right until you find a blank (state 2).  Write 1 there (state
# 2), move to the left until you find a blank (state 3).  When you do,
# move back right (state 3) and erase a 1 and move right again (state
# 4).  Halt.

# St R W M New
0 1 _ r 1   # In state 0, if I see a 1, 
	   # write a blank and move right and goto state 1.
	   # State 0: start state -- erase a one

1 _ _ r 99  # The first number was 0, so I'm okay.
1 1 1 r 2   
           # State 1: 
2 _ 1 l 3   # Put a 1 in the first blank.
2 1 1 r 2 
3 _ _ r 4   # Look for first blank 
3 1 1 l 3 
4 1 _ r 99  # Erase first 1 and halt