for folder in jiawei zehan luoxin placement additional; do
    cd $folder
    for f in *.zip; do
        dir="${f%.zip}"
        if [ -d "$dir" ]; then
            echo "Skipping $f (folder $dir already exists)"
            continue
        fi
        echo "Unzipping $f..."
        mkdir -p "$dir"
        unzip -q "$f" -d "$dir"
    done
cd ..
done