Anchor: When Caterpillar developed the 797 mining truck, a new 360ton payload truck design, it demonstrated design stability by identifying the critical components and building engineering prototypes of them for reliability testing and demonstration of the design before beginning initial manufacturing.
Entailed: Caterpillar demonstrated design stability by identifying critical components of the new 797 mining truck. 
Contradiction: Caterpillar's new 797 is a remake of a classic design, so no testing was needed. 
Contradiction: A Mexican person wearing all black in the woods.
Contradiction: Matchlocks, muskets, and cannons made their appearance after swords, bows, and arrows.
Contradiction: A girl is at the gym.
Contradiction: Do you worry about anything?