Assertion: metric system's unit | /r/HasProperty | followed by supplementary indicator
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Source sentences:
text: In response to the specific requirements of the United Kingdom and of Ireland, both of which were in the process of converting to the metric system, Directive 80/181/EEC incorporated a provision that any unit of measure could be followed by a "supplementary indicator", provided that the supplementary indicator was not the dominant unit and that it was "... expressed in characters no larger than those of the corresponding indication ...".