DHAN7: Check which information benefits can be combined

DHAN7 condition reading: use a fictional combination table to distinguish mutually exclusive options from independent guide access and unresolved pairings.

Two useful options can each be available while their combination is unavailable. That is the puzzle behind a phrase such as “choose either one”. A DHAN7 reader comparing information benefits should ask about relationships between options, as well as the individual conditions for each option. A list describing three items separately may not tell you which pairs can be used for the same task, or whether a restriction concerns one session or a wider period.

## A small combination table

Take a fictional learning programme. Option A is a written guide review. Option B is a live explanation session. Option C is access to a glossary. The stated rule says A and B cannot be selected for the same weekly topic, while C can accompany either. Each option also has its own eligibility condition, assumed satisfied in this exercise. We are now examining combinations, rather than whether an individual reader meets those separate starting conditions.

The programme's defined combinations can be written compactly:

| Selection | Combination condition | |---|---| | A + B | Not together for one weekly topic | | A + C | Allowed | | B + C | Allowed | | A + B + C | Not allowed: A and B conflict |

The last row is important. Adding the compatible glossary does not remove the conflict between A and B. A combination must satisfy all relevant relationships, not merely contain one pair that is allowed somewhere else in the table.

Imagine a reader chooses written review for a difficult diagram and also wants glossary access. A plus C follows the combination rule. Another reader wants written review and a live explanation for that same weekly topic. A plus B fails the stated relationship even though both options are individually described in the programme. The restriction is not saying that B never exists. It is saying that this particular joint selection is outside the defined arrangement.

We distinguish this from a numerical cap. “Choose at most two options” would allow some two-item selections by count, but our example specifically excludes A plus B. The pair has only two items and still fails. Conversely, the programme did not state a general one-item limit because A plus C and B plus C are permitted. Reading a relationship as a simple quantity limit can therefore reject allowed combinations and accept forbidden ones at the same time.

## Read the scope of the exclusion

For DHAN7 condition discussions, the words “same weekly topic” deserve attention. In our exercise they limit the exclusion to that topic. The rule does not by itself explain whether A on one topic and B on a different topic is permitted. Do not widen a narrow restriction into a month-long ban, and do not assume cross-topic permission either. The missing scope is an answerable question, separate from the combinations whose status the table already makes clear.

A change of choice raises another question. Suppose A was selected on Monday but the reader would prefer B on Tuesday. Mutual exclusion does not automatically define a switching process. The programme would need to state whether a prior choice can be changed, when changes stop and what happens to the earlier selection. “Not both” tells you a limit; it does not necessarily tell you how to replace one option with the other after a request has already been made.

If the relationship is unstated, record it as unstated. A description saying “A available” on one page and “B available” on another is not proof that A plus B is allowed. Neither is it proof of an exclusion. A precise question names the pair and scope: “Can written review and the live session apply to the same weekly topic?” This asks for a relationship, whereas “is B available?” asks only about one item and could leave the original uncertainty untouched.

## Choose without changing the rule

Complete the teaching case with a reader whose main need is the diagram's written correction. They choose A and, because terminology is also difficult, add C. The choice satisfies both relevant rules: A and C are compatible, and B is not simultaneously selected. Another reader needing spoken explanation can choose B plus C. Neither has to declare the other route inferior; they are selecting different permitted combinations for different learning needs within the same programme.

The DHAN7 combination puzzle is solved when the reader can explain why A plus C works but A plus B plus C does not. The glossary is compatible with each, yet the underlying A–B conflict remains. Availability of individual items, compatibility of pairs and scope of an exclusion are three separate facts. Keep those facts separate and a benefit comparison becomes a clear choice among defined arrangements, rather than an unsupported expectation that every listed item can be added to every other one.