seq.crossWithSet(Arrays.asList(new String[] {"a"}))
.crossWithSet(Arrays.asList(new String[] {"a"}))
.crossWithSet(Arrays.asList(new String[] {"a"}))
.crossWithSet(Arrays.asList(new String[] {"b"}))
.crossWithSet(Arrays.asList(new String[] {"c"}));
tempE.crossWithSet(Arrays.asList(new String[] {"a"}));
tempE.crossWithSet(Arrays.asList(new String[] {"b"}));
vertifyPTA(en, new String[][] {
new String[] {"a","a","a","b","c","a"},
new String[] {"a","a","a","b","c","b"},
new String[] {"b"}