Assertion: abacus's deck | /r/HasProperty | an upper
Facets:
Source sentences:
text: The suanpan consists of two decks, an upper and a lower, separated by a divider.
text: And so, the pertinent line from the I-Ching was perhaps mis-interpreted; the line appears to describe an actual 3/2 duodecimal abacus, and was referring to its two decks: the upper one (“Heaven”) with three beads per column, and the lower one (“Earth”) with two beads per column.