F.16:16 - Teaching variants

• Single-source direct case. One source, one actual value, one obtaining relation, one boundary; no table or F.9 relation.
• Two-source comparison. Two exact local claims, an optional F.7 row, and one separately supported conclusion.
• Triangulated evidence case. Promise, Work, and observation sources joined by their direct fulfilment, measurement, and evidence relations.
• Difference lesson. Two trigger-word uses kept distinct, with no relation asserted unless one actually obtains.
• Window primer. The same promise and Work evaluated under different explicit windows to show why result, status-use, and verdict-episteme identity must be checked separately.