testing active-low data-rails 
should be able to expect channels 
channel X has value 0, as expected.
channel X has value 0, as expected.
channel X has value 1, as expected.
channel X has value 1, as expected.
channel X has value 0, as expected.
X : .e(init:1) 1x~1of2 expect {0,0,1,1,0,0,}* @5 #0
	count: 1, unknowns: 0
X : .e(init:1) 1x~1of2 expect {0,0,1,1,0,0,}* @5 #0
	count: 0, unknowns: 0
