Anchor: What can it be? I mused, won over to Poirot's views for the moment, although still retaining a faint conviction that the obvious deduction was the correct one. 
Entailed: Slightly believing still that the obvious deduction was the right one.
Contradiction: I gave up all indication that the obvious deduction was correct.
Contradiction: There is a shortage of people in that job because no one wants to do it. 
Contradiction: A small child blows up an orange balloon.
Contradiction: They joined the democratic party,
Contradiction: Humans playing