7 OUTs hit 1st digit. 6 INs and 6 SPIKES hit 2nd digit from Low-to-High view. THUS: IF IN 1stDigit and Trough 2ndDigit hit THEN
1stDigit= 3,4,5,6,7 (IN)
2nd 0,1,8.9 (Trough)
3rd
LHH
(3,4)(8,9)(8,9)
388,389,399,488,489,499
LLH
(3,4)(----)(8,9)
LLL
(3,4)(----)(---)
HHH
(5,6,)(8,9)(8,9)
588,589,599,688,689,699