Anchor: offered a relatively inexpensive, low-risk supplement to the large-scale collection of other information that could be measured more cheaply and reliably than with large-scale studies.
Entailed: Large-scale studies aren't the least expensive option for collecting information.
Contradiction: Large-scale studies were still the most inexpensive means of data collection.
Contradiction: Three children build sandcastles.
Contradiction: Soon he will either have to chance a border crossing or a raid, which will give us an opportunity to get him.
Contradiction: I don't mind if my house gets dirty from muddy kids.
Contradiction: Are we going to talk about social changes here?