 Based on the provided constraints in your DECLARE declarative process model, we can infer a structured workflow for handling and approving a declaration involving multiple activities such as requesting payment, submitting declarations, and getting final approval. Heres an overview of the process:

### Process Overview:

1. **Initialization**: The process starts with the activity "Declaration SUBMITTED by EMPLOYEE." This is the initiating event.
2. **Existence Constraints**: Certain activities must occur at least once:
   - Declaration FINAL_APPROVED by SUPERVISOR
   - Request Payment
   - Payment Handled
   - Declaration SUBMITTED by EMPLOYEE
3. **Exactly 1 Constraint**: Each of the following activities must occur exactly once:
   - Declaration FINAL_APPROVED by SUPERVISOR
   - Request Payment
   - Payment Handled
   - Declaration SUBMITTED by EMPLOYEE
4. **Absence Constraints**: Certain activities should not happen at all, indicating that they are not part of this process:
   - Declaration REJECTED by PRE_APPROVER
   - Declaration FOR_APPROVAL by ADMINISTRATION
   - Declaration REJECTED by ADMINISTRATION
   - Declaration SAVED by EMPLOYEE
   - Declaration REJECTED by EMPLOYEE
   - Declaration FOR_APPROVAL by SUPERVISOR
   - Declaration FOR_APPROVAL by PRE_APPROVER
   - Declaration REJECTED by SUPERVISOR
   - Declaration REJECTED by BUDGET OWNER
   - Declaration APPROVED by PRE_APPROVER
   - Declaration REJECTED by MISSING
5. **Responses and Successions**: Various activities follow specific sequences or trigger other actions:
   - "Declaration SUBMITTED by EMPLOYEE" triggers a series of subsequent steps, leading to final approval and payment handling.
6. **Succession Constraints**: Specific sequences must be followed:
   - After the declaration is submitted, it can lead to requesting payment ("Request Payment").
   - The "Declaration FINAL_APPROVED by SUPERVISOR" follows submission and likely after some approvals (though specific intermediate steps are not listed).
   - Requesting payment must be followed by handling that payment ("Payment Handled").
7. **Co-Existence Constraints**: Certain activities co-exist within the process, ensuring their mutual occurrence:
   - "Request Payment" and "Declaration FINAL_APPROVED by SUPERVISOR."
   - "Request Payment" and "Payment Handled."
   - Other combinations of the main activities (as listed above).
8. **Alternate Succession Constraints**: These ensure a strict order without repetitions between certain actions:
   - Example: "Declaration SUBMITTED by EMPLOYEE" should directly lead to requesting payment and then handling payment, without reoccurring steps in-between.
9. **Chain Response/Successions**: Direct follow-ups are mandatory for some activities:
   - After final approval, the next step must be requesting payment ("Declaration FINAL_APPROVED by SUPERVISOR"  "Request Payment").
   - Requesting payment must immediately lead to handling that payment ("Request Payment"  "Payment Handled").

### Detailed Process Flow:
1. **Employee Submits Declaration**: The process starts with the employee submitting a declaration.
2. **Final Approval by Supervisor**: After submission, the declaration goes through an approval process, eventually resulting in final approval by the supervisor.
3. **Request Payment**: Once approved, a request for payment is made.
4. **Handle Payment**: The requested payment must be handled subsequently.

### Simplified Sequence:
1. Declaration SUBMITTED by EMPLOYEE  (Intermediate steps involving approvals)  Declaration FINAL_APPROVED by SUPERVISOR
2. Request Payment  Payment Handled

This process ensures that every declaration is submitted, approved, and payments are requested and handled in a structured manner without any rejections or unnecessary intermediate approvals. The constraints provide clear guidelines to ensure the proper sequence and occurrence of activities throughout the workflow.