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| graph TD
A[Open File] --> B{File Empty?}
B -- No --> C[Read Data from File]
C --> D{Window Not Full?}
D -- Yes --> E[Send Data]
E --> F{Data Sent Successfully?}
F -- Yes --> G[Start Timer]
F -- No --> H{Wait and Retry?}
H -- Yes --> D
H -- No --> J[Receive Acknowledgment]
J -- Updated Window --> K{End of File?}
K -- Yes --> L[Stop Sending]
K -- No --> D
B -- Yes --> L
J -- Lost Acknowledgment --> M{Resend Data}
M -- Data Resent --> F
J -- Data Received --> N[Write Data to File]
N --> O{Window Not Empty?}
O -- Yes --> P[Update Base]
O -- No --> Q{Continue Receiving?}
Q -- Yes --> J
Q -- No --> R[Stop Sending and Receiving]
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