if the following are true:

• the line at time 14 = 4
• the tab at time 14 = 0
• statement at line 4, tab 1 = a = 9
• Variables Map at time 14 = [ entry a: 7, [ ] ]

then Variables Map at time 15 = [ entry a: 7, [ ] ]

Start from the conclusion and work back up the proof. Click the arrow to show the parents.