C# Get Quarter months :  i want to get the quarter months

scenario 1
```
input one: January / index 1
input two: February / index 2

result = invalid
```

scenario 2
```
input one: January / index 1
input two: July / index 7

result = invalid
```
scenario 3
```
input one: January / index 1
input two: March / index 3

result = valid
```
scenario 4
```
input one: January / index 1
input two: June / index 6

result = valid
```