const location_elements = props.avlReducer.master_structure?.regions.map(x => {
        return x.districts.filter(y => {
            return (props.avlReducer.region == null || props.avlReducer.region == x.name) && (props.avlReducer.district == null || props.avlReducer.district == y.name)
        })
    }).map(z => z.map(y => y.locations?.map(x => (
        <option
        key={`location_${x.name}`}
        >
            {x.name}
        </option>
    ))));