Assertion: abacus | /r/HasProperty | a counting frame
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: An abacus is a counting frame that started out, several thousand years ago, as rows of pebbles in the desert sands of the Middle East.
text: The abacus, also sometimes known as a counting frame, is a calculating tool that was predominantly used in Asia and Africa.
text: The abacus, also known as the counting frame, is the oldest known counting device, originated from early forms of counting boards.