How do you get past the bone puzzle in the labyrinth on Mythology island?

There are 15 bones in three sets of five bones. The object is to take away 6 bones and leave "ten", that is, the LETTERS T-E-N.

Take 3 bones from the first set, leaving two that make the T. Take away 1 bone from the middle set, leaving the four that make an E. Take awayn the 2 bones (top and bottom) from the final group, leaving three that form the N.