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- abstract sig state
- {
- prev : some state,
- next : some state
- }
- one sig begin extends state{}
- some sig end extends state{}
- sig mid extends state{}
- //There is no state after end state, and there is no state before begin state
- pred dosomething
- {
- all s : state, b : begin | b.prev = s
- }
- run{dosomething}
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