original: it has a stopper at the top and stopcock -lrb- tap -rrb- , at the bottom .
simplifications: it has a stopper at the top and stopcock -lrb- tap -rrb- , at the bottom . it has a stopper at the top and stopcock at the bottom . it has a stopper at the top and at the bottom . it has a stopper at the top and stopcock -lrb- tap -rrb- , at the bottom . 1 . it has a stopper at the top and stopcock -lrb- tap -rrb- , at the bottom . it has a stopper at the top and stopcock -lrb- tap -rrb- , at the bottom . it has a stopper at the top and stopcock or tap at the bottom . it has a stopper at the top and a stopcock -lrb- tap -rrb- at the bottom .