('左便', 'left') ('埋便', 'close to the wall') ('下便', 'below')

('前便', 'front') ('後便', 'back') ('開便', 'away from the wall')

('前便', 'front') ('開便', 'away from the wall') ('後便', 'back')

('下便', 'below') ('上便', 'above') ('裡便', 'inside')

('左便', 'left') ('上便', 'above') ('下便', 'below')

('後便', 'back') ('開便', 'away from the wall') ('前便', 'front')

('入便', 'inside') ('右便', 'right') ('出便', 'outside')

('入便', 'inside') ('出便', 'outside') ('右便', 'right')

('上便', 'above') ('裡便', 'inside') ('下便', 'below')

('右便', 'right') ('入便', 'inside') ('出便', 'outside')