Assign items into ordered slots/issues/shelves under grouping conditions

CAT has tested this idea 16 times across 3 papers, from 2019 to 2021. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2020 Slot 2 · DILR Q19	Eight seminars in four 30-minute slots, guides and departments	D
CAT 2020 Slot 2 · DILR Q20	Eight seminars in four 30-minute slots, guides and departments	C
CAT 2020 Slot 2 · DILR Q21	Eight seminars in four 30-minute slots, guides and departments	B
CAT 2020 Slot 2 · DILR Q22	Eight seminars in four 30-minute slots, guides and departments	B
CAT 2020 Slot 2 · DILR Q23	Eight seminars in four 30-minute slots, guides and departments	A
CAT 2020 Slot 2 · DILR Q24	Eight seminars in four 30-minute slots, guides and departments	D
CAT 2021 Slot 1 · DILR Q15	18 papers by eight authors across four journal issues	C
CAT 2021 Slot 1 · DILR Q16	18 papers by eight authors across four journal issues	8
CAT 2021 Slot 1 · DILR Q17	18 papers by eight authors across four journal issues	A
CAT 2021 Slot 1 · DILR Q18	18 papers by eight authors across four journal issues	C
CAT 2021 Slot 1 · DILR Q19	18 papers by eight authors across four journal issues	C
CAT 2021 Slot 1 · DILR Q20	18 papers by eight authors across four journal issues	A
CAT 2019 Slot 1 · DILR Q17	12 items on 16 shelves, types clustered with gaps	D
CAT 2019 Slot 1 · DILR Q18	12 items on 16 shelves, types clustered with gaps	D
CAT 2019 Slot 1 · DILR Q19	12 items on 16 shelves, types clustered with gaps	C
CAT 2019 Slot 1 · DILR Q20	12 items on 16 shelves, types clustered with gaps	D

Part of Scheduling (41 questions since 2017).