NRDC states its mission as follows: The Natural Resources Defense Council's purpose is to safeguard the Earth: its people, its plants, animals, and the natural systems on which all life depends.
NRDC is a mnemonic device that stands for Natural Resources Defense Council.
NRDC is an acronym which qualifies as a mnemonic device. I think the system takes issue with that term.
( z0 device :ARG0-of ( z1 stand :ARG1 ( z2 organization :name ( z3 name :op "Natural" :op "Resources" :op "Defense" :op "Council" ) ) ) :mod ( z4 mnemonic ) )
(z0 / device
    :ARG0-of (z1 / stand-08
                 :ARG1 (z2 / organization
                           :name (z3 / name
                                     :op1 "Natural"
                                     :op2 "Resources"
                                     :op3 "Defense"
                                     :op4 "Council")))
    :mod (z4 / mnemonic))
NRDC is a mnemonic device that stands for Natural Resources Defense Council .
z0 :mod z4
z0 :ARG0-of z1
z1 :ARG1 z2
z2 :name z3
z3 :op3 1
z3 :op2 3
z3 :op1 2
z3 :op4 0