\BeginKnitrBlock{exercise}\iffalse{-91-83-99-101-110-97-114-105-111-115-32-105-110-32-121-111-117-114-32-114-101-115-101-97-114-99-104-93-}\fi{}<div class="exercise"><span class="exercise" id="exr:unnamed-chunk-79"><strong>(\#exr:unnamed-chunk-79)  \iffalse (Scenarios in your research) \fi{} </strong></span>What are one-- and two--sided scenarios in your own research?</div>\EndKnitrBlock{exercise}