The term "reduce" comes from map-reduce where the second step "collects the answers to all the sub-problems and combines them in some way to form the output – the answer to the problem it was originally trying to solve." wikipedia 
We can open a sequence of pages to explore a particular scenario, adjust parameters of that scenario and then document the scenario with hyperlinks to the chosen strategies.
<iframe width="560" height="315" src="https://www.youtube.com/embed/j9jbdgZidu8" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
The similar beer drinkers look to the drinkers before them and adjust their consumption to match.
Take a Few Down
We could have been someone. Well, so could anyone. Leave the remainder for following drinkers:
Bottles of Beer Take a Few Down SUM Bottles of Beer
Try adding more drinking strategies to this scenario to consume the remaining beer.