No. 3.
DOUBLE ENIGMA.
Our firsts in cow, but not in kitten.
Our seconds in coat, but not in mitten.
Our thirds in sword, but not in knife.
Our fourths in horn, but not in fife.
Our fifths in wire, but not in thread.
Our sixths in ran, but not in sped.
Our sevenths in gallant, not in brave.
Our eighths in tunnel, not in cave.
Our ninths in oil, but not in water.
Our tenths in son, but not in daughter.
And if you join these letters well,
You'll find two warriors' names they spell.
Sadie.