title: Multiple If formulas are getting ingored
body: <p>I'm building a little list with filters. My goal is to find a specific person for a specific job. I have different status for people, which I chose from a dropdown list. For example I have 3 different status for the people I add to the list: Student, Assistant and Intern.</p>
  <p>Now I want to filter out specific people with specific status with checkboxes. I'm using following formula which kinda works:</p>
  <p><code>=IF(B10,FILTER(DG:EB,DL:DL=&quot;Student&quot;),IF(B11,FILTER(DG:EB,DL:DL=&quot;Assistant&quot;),IF(B12,FILTER(DG:EB,DL:DL=&quot;Intern&quot;))))</code></p>
  <p>When I mark the checkbox with Student, it shows me all Student like I want. But when I also check the box for Assistant, it still shows only the students instead of showing the students AND assistants. What do I have to change to show me always the selected checkboxes?</p>