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to train intensively by instruction, demonstration and practice. In training drills, one twin
is made the coach and the other the student. The coach in his coaching actions, coaches the student to achieve the purpose of the drill. He coaches with reality and intention following exactly the materials pertaining to the drill to get the student through it. When this is achieved the roles are then reversed—the
student becoming the coach and the coach becoming the student. (HCOB 19 Jun 71 III)