What could it mean? My analysis is in parenthesis.

45 (first attempt at our numeral system) rxdddddddddddddddddddddddddddddddddddddddddddddddd dddddddddddddhjnnnnnnnnnnnnnn (notice the break from n to 5, a sign of intelligence!) 55555555555555555555555555555555555555555555555555 55555555555555555555555555555555555555555555555555 5555555555555555555555555555555555555555555555667( one off!!!)gtbbbbbbbbbbbbbbbbbbbbbbbbbe4 (I have a hunch the rxd in the begining is related somewhat to the be4 at the end)