Long description

A diagram in two parts. The first shos two arrows pointing to a central tile. The arrows show people use evidence (their alarm going off, or the sound of a knock at the door). Arrow 2 shows existing knowledge (that their alarm always goes off at 7 a.m., or an expectation of a delivery). These arrows point to the central square, to indicate an inference of facts (that it is 7 a.m., or that the delivery driver must be at the door).