m= Int(Rnd*3+1)*2
For i=1 To 6-m
For j=6 To i+ 1 Step-1
If a(j)<a(j- 1)Then t= a(j): a(j)= a(j- 1);a(j- 1)=t
Next j
Next i
数组元素a(1)到a(6)的值依次为"98,67,3, 81,38,21", 执行该程序段后,a(1)~a(6)各元素值不可能是( )