Is 'To Stack' Separable or Inseparable? - Phrasal Verb Quiz

Quiz for Verb: 'To Stack '

Is the phrasal verb 'To Stack ' separable or inseparable in the following examples?

'Stack up' - Build up the number of planes waiting to land at an airport

'Stack up' - Increase, accumulate something

'Stack up against' - Be as good as something

'Stack up' - Be logical, make sense

'Stack up' - Accumulate

'Stack up' - Put things in a pile