after 1: foo = a b c
after 2: tot = 6
after: 7
last = c
1 -- 142 1
0 -- 0 1 0
1 -- 0 0 1
1 -- 0 0 1
1 -- 0 1 0
lastpipe1.sub returns 14
A1
A2
B1
B2
HI
A1
A2
B1
B2
HI -- 42 -- 0 42
x=x
x=x