Hei tauira, ka taea e ngā rorohiko mamati te whakamahi anō i te arawhiti tāpiri tīariari me te tiaki i ētahi atu arawhiti hei mahi i tētahi hurihanga iti, mā te whakamahi i te aratuka o ngā kaiwhiwhi e rua hei tohu i ngā kōaro tāpiri, he tino ngāwari te whakamahi i ngā pūmārō (negation).