Test: 2 + + + 3 
DWD: 2 + 3 
Test: 2 - - 3 
DWD: 2 + 3 
Test: 2 - + 3 - - 4 
DWD: 2 - 3 + 4 
Test: ( - - 3 + + 3 ) - - 3 
DWD: ( + 3 + 3 ) + 3 
Test: - - 3 
DWD: + 3 
Test: - + 3 
DWD: - 3 
Test: + - 3 
DWD: - 3 
Test: + + 3 
DWD: + 3 
Test: + + + 3 
DWD: + 3 
Test: - - - 3 
DWD: - 3