diff --git a/cst311/lec/lec9.md b/cst311/lec/lec9.md
index dff5354..96c38c8 100644
--- a/cst311/lec/lec9.md
+++ b/cst311/lec/lec9.md
@@ -23,6 +23,16 @@ We can also denote it with a bar over the expression we want to _not_.
 
 ![Figure-Not](../img/not.png)
 
+### Big AND 
+
+Behavior is the same as an `and` but instead of two inputs we can have many more inputs.
+It will only ever return a 1 if all inputs are 1.
+
+### Big OR 
+
+Again we are mimicing the behvior of the normal or gate but this time we can have multiple inputs as opposed to just two.
+If only one of the many inputs is 1 then we return a 1 for the output of the Big OR.
+
 ## Decoders
 
 Here we'll learn by doing 
@@ -32,11 +42,13 @@ Selector = 2 Bits
 Output = 4 Bits
 ```
 As a challenge you can try using the combinational logic gates from above to try and tackle this yourself
-s1 |s2 |o3 |o2 |o1 |o0
- 0 | 0 | 0 | 0 | 0 | 1
- 0 | 1 | 0 | 0 | 1 | 0
- 1 | 0 | 0 | 1 | 0 | 0
- 1 | 1 | 1 | 0 | 0 | 0
+
+|s1 |s2 |o3 |o2 |o1 |o0 |
+|---|---|---|---|---|---|
+| 0 | 0 | 0 | 0 | 0 | 1 |
+| 0 | 1 | 0 | 0 | 1 | 0 |
+| 1 | 0 | 0 | 1 | 0 | 0 |
+| 1 | 1 | 1 | 0 | 0 | 0 |
 
  
 ## Multiplexor
@@ -50,15 +62,16 @@ It takes a signal as `2^n` inputs and out puts out `n` signals as output.
 Example: We have a selector(s0), two inputs[in0 & in1], and one output `out`. 
 The selector will select an input and we will generate some output in `out`.
 
-s0 | i0 | i1 | out
-0  | 0  | 0  | 0
-0  | 0  | 1  | 1
-0  | 1  | 0  | 0
-0  | 1  | 1  | 1
-1  | 0  | 0  | 0
-1  | 0  | 1  | 0
-1  | 1  | 0  | 1
-1  | 1  | 1  | 1
+|s0 | i0 | i1 | out|
+|---|---|---|---|
+|0  | 0  | 0  | 0|
+|0  | 0  | 1  | 1|
+|0  | 1  | 0  | 0|
+|0  | 1  | 1  | 1|
+|1  | 0  | 0  | 0|
+|1  | 0  | 1  | 0|
+|1  | 1  | 0  | 1|
+|1  | 1  | 1  | 1|
 
 
 This ultimately lets us pick data out of memory given some address.