A method and system for generating design constraints for an electronic circuit design is disclosed. The compounds of the formula I are capable of modulating the body’s production of cyclic guanosine monophosphate and are generally suitable for the therapy and prophylaxis of diseases which are associated with a disturbed cGMP balance. Removal and insertion is accomplished by a specific tool having an end for engaging the plugs. Movement direction and movement distance of the projected image and button click signal are converted into mouse data usable by computer. This way, buyers can create assignments even before funding their accounts on the online market place. The filling apparatus is configured to automatically supply liquid to the liquid-retaining structure when the liquid recedes below a low level that is based on a position of the filling apparatus in relation to the liquid-retaining structure.