casts << {:long=>'cover', :short=>'C', :type=>'uint', :mandatory=>false, :default=>0, :allowed=>nil, :disallowed=>nil}
casts << {:long=>'pairs_min', :short=>'p', :type=>'uint', :mandatory=>false, :default=>5, :allowed=>nil, :disallowed=>nil}
casts << {:long=>'prefix_len', :short=>'P', :type=>'uint', :mandatory=>false, :default=>3, :allowed=>nil, :disallowed=>nil}
-casts << {:long=>'clean', :short=>'x', :type=>'flag', :mandatory=>false, :default=>nil, :allowed=>nil, :disallowed=>nil}
+casts << {:long=>'clean', :short=>'X', :type=>'flag', :mandatory=>false, :default=>nil, :allowed=>nil, :disallowed=>nil}
options = Biopieces.options_parse(ARGV, casts)