Anchor: SCR systems are primarily made from steel, standard mechanical hardware, and catalyst.
Entailed: Steel, mechanical hardware and catalyst are the primary materials used to build SCR systems. 
Contradiction: SCR systems are primarily made from tree branches, lime and sawdust. 
Contradiction: Only define the outcomes that are desired.
Contradiction: I'm going to read all of it.
Contradiction: It is worth celebrating it.
Contradiction: A family on the beach.