13 June 2011

FIFTEENTH

A.  Fencing rules differ depending on the sword.  With épée and foil, only hits from the tip count.  With the sabre, hits count from any part of the blade, though only in the upper body.

B.  According to wikipedia, 11 of the 15 companies with the largest revenues worldwide deal with oil, gas and energy.

C.  http://oeis.org/