foo('0u64', _) ==> <<FALSE>>
foo('1u64', "one")
foo('2u64', _) ==> <<FALSE>>
foo('3u64', "three")
foo('4u64', _) ==> <<FALSE>>
foo('5u64', "five")
foo('6u64', _) ==> <<FALSE>>
foo('7u64', "seven")
foo('8u64', _) ==> <<FALSE>>