Question 170774
9***4 pails.
9***0 fill 9L pail.
5***4 fill 4L. pail.
5***0 empty 4L pail.
1***4 fill 4L pail.
0***1 transfer 1L to 4 L. pail.
9***1 fill 9L. pail.
6***4 fill 4L. pail.
6***0 empty 4L. pail
2***4 fill 4L. pail.
2***0 empty 4L. pail.
0***2 put 2L. in 4L pail
9***2 fill the 9L. pail.
7***4 fill 4L. pail leaving 7 L in the 9L pail.