Hiding Rows that don't display any of three certain values - excel

Question

I have some very basic VBA code here
sub HideRows_Based_On_Values
For Each cell in Range (C12:AG37)
if cell.value = "SD" or "SA" or "SN" then cell.entirerow.hidden = false
else cell.entirerow.hidden = true
next cell
End Sub
The range is correct, the inputs in the cells are correct.
For some reason, excel is hiding some (not all) of the rows that have at least one of these values present in them. I can't figure out what I'm doing wrong.
I expected for the code to filter out any rows that don't have one of SD, SA, or SN present - but it's only working on some of the rows and not all.

Answer 1

Not:
A = 1 OR 2 OR 3
But:
(A = 1) OR (A = 2) OR (A = 3)
This is true in every computer program, computer programming language, ...
I've been testing until it worked and this is what I came up with:
Sub HideRows_Based_On_Values()
For Each cell In Range("C12:AG37")
If ((cell.Value = "SD") Or (cell.Value = "SA") Or (cell.Value = "SN")) Then
cell.EntireRow.Hidden = False
Else: cell.EntireRow.Hidden = True
End If
Next cell
End Sub
The weird part is that, next to the range where you need double quotes (Range("C12:AG37")), you need to put the action of the Then on the next line, otherwise it won't work.
Before:
After:
Edit:
Hereby the solution, as provided by the author of the question:
Sub HideRows_Based_On_Values()
For Each Row In Range("C12:AG37").Rows
If Application.CountIf(Row, "SD") + Application.CountIf(Row, "SA") + Application.CountIf(Row, "SN") = 0 Then
Row.Hidden = True
Else Row.Hidden = False
End If
Next Row
End Sub

Answer 2

sub HideRows_Based_On_Values
For Each cell in Range (C12:AG37)
if cell.value = "SD" OR cell.value = "SA" OR cell.value = "SN" then
cell.entirerow.hidden = false
else
cell.entirerow.hidden = true
end if
next cell
End Sub