Four $$2$$-digit numbers are made up from the digits $$1, 2, 3, \cdots, 8$$ with no repetition. The following are the hints about these numbers:  * In the smallest number, the ones digit is twice the tens digit.  * In the largest number, the sum of ones and tens digits is $$9$$.  * In the second largest number, the tens digit is $$5$$ more than the ones digit.  * There is only $$1$$ odd number among these $$4$$ numbers.  Find the second smallest number. 
Overseas Competition->Knowledge Point->Combinatorics->Logical Reasoning