| Impermanent |
| Penciled-in |
| Easy to undo |
| Not permanent |
| Like some pens |
| Like CD-RW discs |
| Like whiteboards |
| Like blackboards |
| Like a whiteboard |
| Subject to removal |
| Easy to wipe clean |
| Not fixed, in a way |
| Not permanent, as ink |
| In pencil, for example |
| Like some typing paper |
| Like some compact discs |
| Like some wall calendars |
| Subject to being wiped out |
| Like chalk on a chalkboard |
| Like slates and hard drives |
| Unlocked, as a computer file |
| Can be easily removed by rubbing |
| Like whiteboards and blackboards |
| Easy to get rid of, as pencil marks |