st: extract middle of string

[Ronnie Babigumira <rb.glists@gmail.com>]

I have a string variable that looks like this

           x
 161011000AT
 161011000CN
1610110012CN


I am interested in what lies between the first and the last two characters

I could have used

gen str10 = subst(x, 2, 8) but that would not work for the last observation. How can I simply drop the first character, 
and last two charters in x

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