Dear Maintainer,
* What led up to the situation?
* What exactly did you do (or not do) that was effective (or
ineffective)?
apropos -e HOST
* What was the outcome of this action?
arping (8) - send ARP REQUEST to a neighbour host
...
* What outcome did you expect instead?
Only lines with verbatim "HOST" lines
(The option -e used for an "exact" search as a demostration.)