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A State Machine Diagram for an Online Re-registration and Fee Payment Subsystem models the dynamic behavior of the system by representing different states, transitions, events, guard conditions, and actions during the re-registration process. It helps developers understand how the system reacts to user actions and external events while ensuring consistency, security, and transactional integrity. The following textual representation captures the complete execution lifecycle. ``` +------------------+ | Initial | +------------------+ | | Open Portal v +----------------------+ | Login Requested | +----------------------+ | Credentials Valid | Invalid Credentials [User Authenticated] | [Attempts < 3] v +----------------------+ | User Dashboard | +----------------------+ | | Select Re-registration v +----------------------+ | Eligibility Checking | +----------------------+ | [Eligible = Yes] | [Eligible = No] |----------------------------> | Display Error | | | v | Final State | v +--------------------------+ | Registration Form Open | +--------------------------+ | Fill & Submit Form | v +--------------------------+ | Validate Input Data | +--------------------------+ | | [Data Valid] | | [Data Invalid] | | | Show Validation Errors | | |<-----------------| | _____ __________ __________ _____ ___ __________ ___ ___.
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