Mischna zu Bereschit 24:15

One who had ten rows each containing ten jugs of wine, and said: “One exterior row shall be tithe,” and it is not known which row [he meant], he must take two jugs [each from the ends of] a diagonal line. [If he had said:] “One half of one exterior row shall be tithe” and it is not known which half row [he meant], he must take four jugs from the four corners. [If he had said:] “One row shall be tithe,” and it is not known which row [he meant], he must take one [whole] row in a diagonal line. [If he had said:] “Half of one row shall be tithe,” and it is not known which half row [he meant], he must take two rows in a diagonal line. [If he had said:] “One jug shall be tithe,” and it is not known which jug [he meant],he must take from every jug.