Using multiple conditions (AND) in SASS IF statement

Question

From the Sass language reference documentation:

Boolean Operations

SassScript supports and, or, and not operators for boolean values.

(link)

So an if statement expression with a compound condition would look like this:

@if $var1 == value1 and $var2 == value2 {
    // ...
}

Further, parentheses can be used to affect the order of operations in a more complicated expression:

@if ($var1 == value1 and not ($var2 == value2)) or ($var3 == value3) {
    // ...
}