(ordered by popularity)
raw
other
different
various
organic
instructional
composite
educational
available
hazardous
basic
necessary
visual
printed
solid
magnetic
ceramic
synthetic
biological
plastic
industrial
polymeric
structural
toxic
historical
suitable
audiovisual
appropriate
related
nuclear
porous
brittle
metallic
combustible
essential
radioactive
soft
based
inorganic
valuable
promotional
archival
crystalline
strategic
granular
dental
ferromagnetic
relevant
useful
resistant
amorphous
concrete
expensive
restorative
dielectric
cheap
refractory
sensitive
conventional
fibrous
recycled
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