Assertion: triangle's number | /r/CapableOf | produce the number
Facets:
value: in the fourth row
type: LOCATION
Source sentences:
text: For example, the initial number in the first (or any other) row is 1 (the sum of 0 and 1), whereas the numbers 1 and 3 in the third row are added to produce the number 4 in the fourth row.