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And there , at the door of a grimy , old building in the slums of London , the searchers came to a blank wall - - baffled . Firstly let me add a useful tip sent in by Jim Haas to add to the topic of commenting your code : " I also find it helpful to make my comments different bg and text colors from anything else in the code and insert a blank line before and after them . A copy of a blank MSDS and instructions can be obtained from The Office of Environmental Health and Safety . An electronic copy of a blank permit for use as part of a departmental management system is available by email or written application to SEPS . Creating an instance involves filling out a blank form of the appropriate type .