It can also be difficult to categorise some surveillance systems into separate disease, hazard and intervention areas.
"Her books are very unusual and difficult to categorise.
Warchus called it "a beautiful and exciting" project that was difficult to categorise.
It would, therefore, be difficult to categorise ruptured membranes as a substantial risk to life.
Various venues, Sat to 13 Feb OB Gerard Byrne's art is unusually and deliberately difficult to categorise.
A former street performer and trained circus artist, New Zealander Sam Wills's brand of entertainment is difficult to categorise.
It is difficult to categorise Søren Kierkegaard: to some readers he is primarily a philosopher, to others a Christian thinker or theologian.
RJ: Not just period pieces, but they're both essentially romantic films, although The Illusionist goes in so many different directions that it's difficult to categorise.
Unlike nearby Buenos Aires, whose crooked street pattern is difficult to categorise, Benoit's city – La Plata – would be a perfect square grid, measuring 36 by 36 blocks.
