::emit<::decltype(::sum<::difference<'F', 'A'>, ::difference<'C', 'A'>>)>::commit;
::emit<::decltype(::product<::difference<'D', 'A'>, ::difference<'E', 'A'>>)>::commit;
::emit<::decltype(::quotient<::difference<'H', 'A'>, ::difference<'C', 'A'>>)>::commit;