a(i)= Int(Rnd * 20) + 1 Next i
For i= 2 To 5
If i Mod 2 = 1 And a(i-1) < a(i)Then t=a(i):a(i)=a(i-1):a(i-1)=t
Else
a(i)=a(i)-1 End If
Next i
执行该程序段后,a(1)~ a(5)各元素不可能的值是( )
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