/a/ - Cobblestone
/b/ - Brick
/c/ - Carpeting
/d/ - Dirt & Gravel
/f/ - Asphalt
/g/ - Astro-Turf
/h/ - Hardwood floors
/k/ - Concrete & Cement
/l/ - Linolieum
/m/ - Metal
/r/ - Rugs
/t/ - Tiling