| Class | Superclass | Slots |
| interval |
| Word | Stack effect |
| ( new assoc -- ) | |
| ( new -- ) | |
| ( live-interval -- ) | |
| ( live-interval -- ) | |
| ( interval -- * ) | |
| ( live-interval -- ) | |
| ( live-interval new -- n ) | |
| ( live-intervals new assoc -- ) | |
| ( live-interval -- rep/f ) | |
| ( new assoc -- ) | |
| ( live-interval -- rep/f ) | |
| ( live-interval n -- ) | |
| ( after -- after/f ) | |
| ( new pair -- ) | |
| ( before -- before/f ) | |
| ( new reg -- ) | |
| ( new reg -- ) | |
| ( new reg -- ) | |
| ( new pair -- ) | |
| ( new pair -- ? ) | |
| ( new pair -- ) | |
| ( new -- use-pos ) | |
| ( live-interval n -- before after ) | |
| ( live-interval -- ) | |
| ( live-interval -- ) |
| Word | Stack effect |
| ( object -- ? ) |