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auto-multiple-choice: prioritize . and the package's dir in $TEXINPUTS
A : at the start of $TEXINPUTS means LaTeX should try the standard directories first, a : at the end means to use the standard directories as a fallback. In case the user mixes versions of packages, there may be another automultiplechoice.sty in the standard directories, and we don't want to use this other one. Fix this by putting the : at the end of $TEXINPUTS.