Captcha: L or One?

I'm not complaining about the new system, given the alternative.

But using lower-case Courier type as the system does, is there a way to tell the difference between the letter "l" and the number "1"? (Or alternatively. a way of eliminating one or both of them?) I've guessed right three times out of four so far (and on the fourth, the retest didn't include it), but I'm still sort of waiting for it to blow up on me.

Does anyone here know?

Eric