Question: Lost data in worksheet

While I am working with a problem , suddenly the message 'Kernel connection lost' appeared. After that I restarted maple and then I opened my work sheet again , but I lost all my equations and data in the work sheet. I dont know why? All my work is total empty. 

How can I recover the work sheet data? Solutions are appreciated.

I have attached the lost work sheet for your reference. 

 

Thanking you.

 

 

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