'********** structural transformation 'Acid can react with base. (/,reaction,_,base)>. 3 'An acid and a base can have a reaction. ''outputMustContain('<(*,acid,base) --> reaction>. %1.00;0.90%') 'A base is something that has a reaction with an acid. ''outputMustContain(' (/,reaction,acid,_)>. %1.00;0.90%')