3.5×3.6+1.4×3.5的简便算法是（    ）。

下面程序的功能是把文件file11.txt中重复字符去掉后(即若有多个字符相同，则只保留一个)写入文件file2.txt。请填空。
Private Sub Command1_Click()
Dim inchar AS String, temp AS String, outchar AS String
Outchar=""
Open "file1.txt" For Input AS #1
Open "file2.txt" For Output AS (7)
n=LOF( (8) )
inchar=Input$(n,1)
For k=1 To n
temp=Mid(inchar,k,1)
If InStr(outchar, temp)= (9) Then
outchar=outchar & temp
End If
Next k
print #2, (10)
close #2
close #1
End Sub