FDF FSF FAF FGF FRF FEF FWF FQF FTF FVF FCF FXF FZF FBF DSD DAD DGD DFD DED DWD DQD DTD DRD DCD DXD DZD DBD DVD SAS SGS SFS SDS SWS SQS STS SRS SES SXS SZS SBS SVS SCS AGA AFA ADA ASA AQA ATA ARA AEA AWA AZA ABA AVA ACA AXA GFG GDG GSG GAG GYG GRG GEG GWG GQG GBG GVG GCG GXG GZG