Assertion: mallard | /r/HasProperty | one of a few of the class
Facets:
Source sentences:
text: The A4 class was designed for sustained 100+ mph (160+ km/h) running, and Mallard was one of a few of the class that were built with a double chimney and double Kylchap blastpipe, which made for improved draughting and better exhaust flow at speed.