Assertion: mortarboard | /r/HasProperty | placed upon a support surface
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Source sentences:
text: It will be appreciated that the intended use for the mortarboard configurations of this invention is for such mortarboards to be placed upon a support surface such that the bottom of the mortarboard engages the support surface, and the upper surfaces 13 and 13′ face upwardly so as to accommodate the acceptance of a charge of mortar, cementitious or other such product thereon.