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This is regarding a dog only.
( z0 regard :ARG0 ( z1 this ) :ARG1 ( z2 dog ) :mod ( z3 only ) )
(z0 / regard-01
    :ARG0 (z1 / this)
    :ARG1 (z2 / dog)
    :mod (z3 / only))
This is regarding a dog only .
z0 :ARG0 z1
z0 :ARG1 z2
z0 :mod z3