Within 48 hours, people tend to forget approximately 50 percent of what was said in a 10-minute conversation.
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It required south vietnamese troops replacing American troops 
 
        
             
        
        
        
The occupation that it referring to is : skilled and unskilled miners
This treaty was enacted in 1880 , back then the job as a miners is pretty much the equivalent of today's engineer in the term of hotness and availability.
Hope this helps
        
             
        
        
        
Food maybe one hunted and one grew crops
        
             
        
        
        
Its A... I like 99.99% sure it's A. because you have to pay back what you borrowed from the banm