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Thus , it is recommended that cancers confined to the mucosa ( m-cancers ) that are more than 1.0 cm in diameter should not be treated with limited surgery without lymphadenectomy . Reaction of Acetylene with Pure Oxygen - Due to the low ignition energies required to ignite acetylene , oxygen / acetylene torches can also be ignited by first turning on the acetylene , and then the oxygen . The panel provides scientific advice to EPA on issues related to pesticides . It soon got shortened to " Chambers , " of course .