This doesn't help the discussion much/any, but yeah, the sets are in alphabetical order.. there are a bunch of identifiers in the executable that correspond to the sets:
(but note that there are other identifiers intermixed refering to other stuff, removed from this list..)

AMMO
BAT
BEEBOY
BEES
BIGBOX
BIGROCK
BIGTREE
BILSBOSS
BIRD
BIRD3D
BOLLPLAT
BONUS
BOSS
BRIDGE
BUBBA
BUMBEE
BUTTERFLY
CARROTPOLE
CAT
CAT2
CATERPIL
CHUCK
COMMON
CONTINUE
DEMON
DESTSCEN
DEVAN
DEVILDEVAN
DIAMPOLE
DOG
DOOR
DRAGFLY
DRAGON
EVA
FACES
FATCHK
FENCER
FISH
FLAG
FLARE
FONT
FROG
FRUITPLANT
GEMRING
GLOVE
GRASSPLAT
HATTER
HELMUT
JAZZ
JAZZ3D
JUNGPOLE
LABRAT
LIZARD
LORI
LORI2
MENU
MENUFONT
MONKEY
MOTH
PICKUPS
PINBALL
PINKPLAT
PSYCHPOLE
QUEEN
RAPIER
RAVEN
ROBOT
ROCK
ROCKTURT
SKELETON
SMALTREE
SNOW
SONCSHIP
SONICPLAT
SPARK
SPAZ
SPAZ2
SPAZ3D
SPIKEBOLL
SPIKEBOLL3D
SPIKEPLAT
SPRING
STEAM
SUCKER
TUBETURT
TUFBOSS
TUFTURT
TURTLE
TWEEDLE
UTERUS
VINE
WARP10
WARP100
WARP20
WARP50
WITCH
XBILSY
XLIZARD
XTURTLE
ZDOG
ZSPARK