Looking for mere turns up examples like this one:
(NP (DT a)
(JJ mere)
(NN majority)
(PP (IN of)
(NP (NNPS Senators))))))))
The following query matches that structure and ones like it:
tgrep '/^JJ/ $ /^N/' | more
tgrep complains because the sister relationship doesn't give it a clear master node to print. If you want to see the whole NP instead, do this:
tgrep '/^NP/ < (/^JJ/ $ /^N/)' | more
Or, equivalently:
tgrep '/^NP/ < /^JJ/ < /^N/' | more