For i = 1 To 6
a(i) = Int(Rnd * 15)
If i >= 3 Then
If a(i) = a(i - 1) + a(i - 2) Then
a(i) = a(i) Mod 2
Else
a(i) = a(i) \ 2
End If
Next i
执行该程序段后,在下列选项中,a(1)~a(6)各元素值不可能的是( )