cheat sheets.

              :                                 :       
            :                                   :       
            :  RRVIttIti+==iiii++iii++=;:,       :      
            : IBMMMMWWWWMMMMMBXXVVYYIi=;:,        :     
            : tBBMMMWWWMMMMMMBXXXVYIti;;;:,,      :     
            t YXIXBMMWMMBMBBRXVIi+==;::;::::       ,    
           ;t IVYt+=+iIIVMBYi=:,,,=i+=;:::::,      ;;   
           YX=YVIt+=,,:=VWBt;::::=,,:::;;;:;:     ;;;   
           VMiXRttItIVRBBWRi:.tXXVVYItiIi==;:   ;;;;    
           =XIBWMMMBBBMRMBXi;,tXXRRXXXVYYt+;;: ;;;;;    
            =iBWWMMBBMBBWBY;;;,YXRRRRXXVIi;;;:;,;;;=    
             iXMMMMMWWBMWMY+;=+IXRRXXVYIi;:;;:,,;;=     
             iBRBBMMMMYYXV+:,:;+XRXXVIt+;;:;++::;;;     
             =MRRRBMMBBYtt;::::;+VXVIi=;;;:;=+;;;;=     
              XBRBBBBBMMBRRVItttYYYYt=;;;;;;==:;=       
               VRRRRRBRRRRXRVYYIttiti=::;:::=;=         
                YRRRRXXVIIYIiitt+++ii=:;:::;==          
                +XRRXIIIIYVVI;i+=;=tt=;::::;:;          
                 tRRXXVYti++==;;;=iYt;:::::,;;          
                  IXRRXVVVVYYItiitIIi=:::;,::;          
                   tVXRRRBBRXVYYYIti;::::,::::          
                    YVYVYYYYYItti+=:,,,,,:::::;         
                    YRVI+==;;;;;:,,,,,,,:::::::