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* Two ships fly directly away or toward one another (zero transversal) | * Two ships fly directly away or toward one another (zero transversal) | ||
* Two ships fly perfectly parallel to one another at the same speed (zero transversal) | * Two ships fly perfectly parallel to one another at the same speed (zero transversal) | ||
* Two ships are stationary (zero transversal) | |||
* One ship chases the other ship | * One ship chases the other ship | ||