How to Get Exact Indices of Elements in a List Without Sorting in Appian?

Hi Everyone,

I'm working with two lists in Appian and need to find the exact indices of elements from one list (local!checkList2) in another list (local!sourceList2) without sorting the data. For example, if local!sourceList2 is {1, 2, 3, 4, 5, 1, 2, 6, 3, 2, 7, 2} and local!checkList2 is {1, 2}, I want to get the indices where these values appear in local!sourceList2 in the original order.

I've tried using wherecontains, but it sorts the data, which I don't want. 

a!localVariables(
  local!sourceList: {3, 4, 5, 3, 7, 4, 7, 6, 5, 4, 3, 9, 2, 2, 3, 2, 2, 3, 3, 2, 4, 2, 2, 2, 2, 3, 2, 2, 3, 2, 4, 2, 3, 2, 2, 2, 4, 3, 2, 2, 2, 2, 2, 3, 2, 4, 5, 4, 2, 5, 6, 3, 4, 4, 7, 3, 4, 6, 4, 4, 2, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 5, 6, 2, 2, 2, 2, 2, 2, 3, 4, 5, 3, 7, 4, 7, 6, 5, 4, 3, 9, 2, 2, 3, 2, 2, 3, 3, 2, 4, 2, 2, 2, 2, 3, 2, 2, 3, 2, 4, 2, 3, 2, 2, 2, 4, 3, 2, 2, 2, 2, 2, 3, 2, 4, 5, 4, 2, 5, 6, 3, 4, 4, 7, 3, 4, 6, 4, 4, 2, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 5, 6, 2, 2, 2, 2, 2, 2, 3, 4, 5, 3, 7, 4, 7, 6, 5, 4, 3, 9, 2, 2, 3, 2, 2, 3, 3, 2, 4, 2, 2, 2, 2, 3, 2, 2, 3, 2, 4, 2, 3, 2, 2, 2, 4, 3, 2, 2, 2, 2, 2, 3, 2, 4, 5, 4, 2, 5, 6, 3, 4, 4, 7, 3, 4, 6, 4, 4, 2, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 5, 6, 2, 2, 2, 2, 2, 2, 3, 4, 5, 3, 7, 4, 7, 6, 5, 4, 3, 9, 2, 2, 3, 2, 2, 3, 3, 2, 4, 2, 2, 2, 2, 3, 2, 2, 3, 2, 4, 2, 3, 2, 2, 2, 4, 3, 2, 2, 2, 2, 2, 3, 2, 4, 5, 4, 2, 5, 6, 3, 4, 4, 7, 3, 4, 6, 4, 4, 2, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 5, 6, 2, 2, 2, 2, 2, 2, 3, 4, 5, 3, 7, 4, 7, 6, 5, 4, 3, 9, 2, 2, 3, 2, 2, 3, 3, 2, 4, 2, 2, 2, 2, 3, 2, 2, 3, 2, 4, 2, 3, 2, 2, 2, 4, 3, 2, 2, 2, 2, 2, 3, 2, 4, 5, 4, 2, 5, 6, 3, 4, 4, 7, 3, 4, 6, 4, 4, 2, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 5, 6, 2, 2, 2, 2, 2, 2, 3, 4, 5, 3, 7, 4, 7, 6, 5, 4, 3, 9, 2, 2, 3, 2, 2, 3, 3, 2, 4, 2, 2, 2, 2, 3, 2, 2, 3, 2, 4, 2, 3, 2, 2, 2, 4, 3, 2, 2, 2, 2, 2, 3, 2, 4, 5, 4, 2, 5, 6, 3, 4, 4, 7, 3, 4, 6, 4, 4, 2, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 5, 6, 2, 2, 2, 2, 2, 2, 3, 4, 5, 3, 7, 4, 7, 6, 5, 4, 3, 9, 2, 2, 3, 2, 2, 3, 3, 2, 4, 2, 2, 2, 2, 3, 2, 2, 3, 2, 4, 2, 3, 2, 2, 2, 4, 3, 2, 2, 2, 2, 2, 3, 2, 4, 5, 4, 2, 5, 6, 3, 4, 4, 7, 3, 4, 6, 4, 4, 2, 3, 2, 2, 2, 4, 2, 2, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 5, 6, 2, 2, 2, 2, 2, 2},
  local!checkList: {9, 7, 6, 5, 4, 3, 2},
  local!sourceList2: {1, 2, 3, 4, 5, 1, 2, 6, 3, 2, 7, 2},
  local!checkList2: {1, 2},
  a!map(
    shorterList: wherecontains(local!checkList2, local!sourceList2),
    longerList:  wherecontains(local!checkList, local!sourceList)
  )
 
  
)

I am avoiding loops as it will increase Latency. Is there a way to achieve this with Appian's built in functions.