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View Compilation Error

0_0_33877285_6256.cpp:7:1: error: 'usingnamespace' does not name a type
 usingnamespace std;
 ^
0_0_33877285_6256.cpp: In function 'int intmain()':
0_0_33877285_6256.cpp:27:22: error: 'stringtem' was not declared in this scope
                      stringtem="";
                      ^
0_0_33877285_6256.cpp:31:22: error: 'tem' was not declared in this scope
                      tem=tem+str[i]+str[i+1];
                      ^


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