Part 1: http://catstuxedo.deviantart.com/art/Cutie-Mark-Crusaders-GTS-1-4-557357640
Part 2: http://catstuxedo.deviantart.com/art/Cutie-Mark-Crusaders-GTS-2-4-557357683
Part 3: http://catstuxedo.deviantart.com/art/Cutie-Mark-Crusaders-GTS-3-4-557357701
Part 4: http://catstuxedo.deviantart.com/art/Cutie-Mark-Crusaders-GTS-4-4-557357731
not provided yet