    Sentence 1: What type of materials inside the  abin were removed to help prevent. more fire|         thazards in the future?    Sentence 2: To remedy the causes of the fire  changes were made in the Block II spacecraft         land operational procedures, the most  important of which were use of a nitrogen  loxygen mixture instead of pure oxygen before  land during launch, and removal of flammable  lcabin and space suit materials.    