Anchor: These methodological problems can mask valid intervention effects.
Entailed: These methodological challenges can obscure real intervention effects.
Contradiction: If an intervention is successful, no one should worry about how methodological problems interfering with the effects.
Contradiction: It's possible to put into words. 
Contradiction: Stanley Market is well known for all different types of clothing.
Contradiction: A girl in a gray shirt is sitting on her hands.
Contradiction: The group is outdoors.