P:\test\demerphq>u:head test.words
AAAAAAAAAA
CCAAAAAAAA
CGAAAAAAAA
CTAAAAAAAA
CACAAAAAAA
CAGAAAAAAA
CATAAAAAAA
CAACAAAAAA
CAAGAAAAAA
CAATAAAAAA

P:\test\demerphq>u:tail test.words
AAAAAAATAT
AAAAAAAACC
AAAAAAAACG
AAAAAAAACT
AAAAAAAAGC
AAAAAAAAGG
AAAAAAAAGT
AAAAAAAATC
AAAAAAAATG
AAAAAAAATT