The cache is not at the posted coordinates and there is no benefit in visiting that location.
My mother always used to tell me not to tell fibs. But she also told me for a number of my early years that there was a Father Christmas, that the tooth fairy would leave some money under my pillow and leaving new shoes on a table brought bad luck. So forgive me for feeling a little confused, although I may be guilty of that same sins with my own children. Nevertheless, whilst she never claimed that there was a pot of gold at the end of the rainbow, she did tell me that there might be a 'pot' if I solved this riddle. Or was she fibbing again?
My first is the eleventh minus the second
My second is the eighth minus the seventh
My third is the ninth minus the fifth
My fourth is the first
Assume N51 15 and E001 16