#cap-shape:                bell=b,conical=c,convex=x,flat=f,
#                               knobbed=k,sunken=s
#   2. cap-surface:              fibrous=f,grooves=g,scaly=y,smooth=s
#   3. cap-color:                brown=n,buff=b,cinnamon=c,gray=g,green=r,
#                               pink=p,purple=u,red=e,white=w,yellow=y
#   4. bruises?:                 bruises=t,no=f
#   5. odor:                     almond=a,anise=l,creosote=c,fishy=y,foul=f,
#                                musty=m,none=n,pungent=p,spicy=s
#   6. gill-attachment:          attached=a,descending=d,free=f,notched=n
#   7. gill-spacing:             close=c,crowded=w,distant=d
#   8. gill-size:                broad=b,narrow=n
#   9. gill-color:               black=k,brown=n,buff=b,chocolate=h,gray=g,
#                                green=r,orange=o,pink=p,purple=u,red=e,
#                                white=w,yellow=y
#  10. stalk-shape:              enlarging=e,tapering=t
#  11. stalk-root:               bulbous=b,club=c,cup=u,equal=e,
#                                rhizomorphs=z,rooted=r,missing=?
#  12. stalk-surface-above-ring: ibrous=f,scaly=y,silky=k,smooth=s
#  13. stalk-surface-below-ring: ibrous=f,scaly=y,silky=k,smooth=s
#  14. stalk-color-above-ring:   brown=n,buff=b,cinnamon=c,gray=g,orange=o,
#                                pink=p,red=e,white=w,yellow=y
#  15. stalk-color-below-ring:   brown=n,buff=b,cinnamon=c,gray=g,orange=o,
#                                pink=p,red=e,white=w,yellow=y
#  16. veil-type:                partial=p,universal=u
#  17. veil-color:               brown=n,orange=o,white=w,yellow=y
#  18. ring-number:              none=n,one=o,two=t
#  19. ring-type:                cobwebby=c,evanescent=e,flaring=f,large=l,
#                                none=n,pendant=p,sheathing=s,zone=z
#  20. spore-print-color:        black=k,brown=n,buff=b,chocolate=h,green=r,
#                                orange=o,purple=u,white=w,yellow=y
#  21. population:               abundant=a,clustered=c,numerous=n,
#                                scattered=s,several=v,solitary=y
#  22. habitat:                  grasses=g,leaves=l,meadows=m,paths=p,
#                               urban=u,waste=w,woods=d
#
#8. Missing Attribute Values: 2480 of them (denoted by "?"), all for
#  attribute #11.
#
#9. Class Distribution: 
#   --    edible: 4208 (51.8%)
#  -- poisonous: 3916 (48.2%)
#  --     total: 8124 instances
cap-shape:  b, c, x, f, k, s
cap-surface: f, g, y, s
cap-color: n, b, c, g, r, p, u, e, w, y
bruises?: t, f
odor: a, l, c, y, f, m, n, p, s
gill-attachment: a, d, f, n
gill-spacing: c, w, d
gill-size: b, n
gill-color: k, n, b, h, g, r, o, p, u, e, w, y
stalk-shape: e, t
stalk-root: b, c, u, e, z, r 
stalk-surface-above-ring: f, y, k, s
stalk-surface-below-ring: f, y, k, s
stalk-color-above-ring: n, b, c, g, o, p, e, w, y
stalk-color-below-ring: n, b, c, g, o, p, e,  w, y
veil-type: p, u
veil-color: n, o, w, y
ring-number: n, o, t
ring-type: c, e, f, l, n, p, s, z
spore-print-color: k, n, b, h, r, o, u, w, y
population: a, c, n, s, v, y
habitat: g, l, m, p, u, w, d
class: e, p