\starttext

    \language[fr]

    \startexceptions æ-sop \stopexceptions

    \hsize 1mm \dontcomplain aesop oedipus æsop œdipus

    \blank

    \installlanguage[frx][default=fr,patterns=fr,factor=yes]

    \language[frx]

    \startexceptions æ-sop \stopexceptions

    \hsize 1mm \dontcomplain aesop oedipus æsop œdipus

\stoptext

