default:
>	1	2	3	4	5	6	7	8	9	0

clear non-existant:    x                    x
>	1	2	3	4	5	6	7	8	9	0

clear 2 and 4:  x               x
>	1	3	5	6	7	8	9	0

clear 0:							x
>	1	3	5	6	7	8	9	0

clear after 0:							.x
>	1	3	5	6	7	8	9	0

clear all:
>	0done

TBC at end with clipping:             ABCDEFGHIJKLMNOPQRSTUVWXYZ01234567890abcdeMD!