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char** c =(char**)malloc( sizeof(char*) * n );
for( i = 0 ; i < n ; i++ )
c[i] = (char*)malloc( sizeof(char)*10 );
for( i = 0 ; i < n ; i++ )
free( c[i] );
free( c );
char** c =(char**)malloc( sizeof(char*) * n );
for( i = 0 ; i < n ; i++ )
c[i] = (char*)malloc( sizeof(char)*10 );