Comment by zvr

> Some of the samples lack a 1 (/one) or a 0 (/zero). That’s because some typewriters lacked those keys. To save space, weight, and manufacturing costs (so more common on portables and consumer models), a 1 could be typed using the lowercase L, and a 0 could be typed using the uppercase O.

I always used a capital i (I) for one (1); I don't remember ever encountering a "lowercase L".