How to control the loop within expect.

I just met a problem when I have a loop and an expect in this loop.
for example
for {set i 1} {i<10} {incr i} {
send a commanda
expect {
1 {puts 1}
2 {puts 2}
3 {........}
}
send a commandb
}
when I get the value 1, I will puts 1 and execute the commandb, so as
2.but my question is if I get the value 3, I want to continue the loop
but not execute send the commandb.
I've used break or exit , these all seemed exit the loop.
Do anybody knows this?
Thanks.

.

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