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         Make key

        Produce a simple key for the pedigree diagram indicating the 
        scheme used for shading symbols. The file giving this 
        information must already exist on disk (it can be created with 
        the "Edit a file option" <EDITFILE>). The format of the file 
        is that there is one optional title line for the key, 
        followed by up to ten lines each beginning with a number 
        followed by an explanation of the diagnosis this represents, 
        e.g.: 

        Key for manic depressive pedigree
        1 Bipolar disorder
        2 Unipolar depression
        0 Unaffected
        100 Deceased

        A male symbol shaded appropriately will be drawn followed by the 
        text given.

        You will also be prompted for the name of the file to save the 
        key to, and this should have the extension MSP, e.g. KEY.MSP. 
        Alternatively entering 0 for the filename will prevent the key 
        being saved to disk.
        
