part4_key.txt

--- Part 4 output ---
list->front() threw a length_error exception
list->back() threw a length_error exception
list->front() = 5
list->back() = 9
list->at(0) = 0
list->at(1) = 1
list->at(4) = 4
list->at(8) = 8
list->at(9) = 9
list->at(10) threw an out_of_range exception
list->at(29) threw an out_of_range exception
list->front() = 0
list->back() = 9