How to print pattern below pattern.

Sorry, but why would I want to do that? Ask concrete questions and you will get support.

What did you try? Do you have a specific question?

Hint: Combine two nested foreach(), code() and enumerate().

I am also eager to know your use case. But this is how you would be able to create this pattern. You can take local!alphabet in a constant from A-Z and bring upto the letter for which you want to iterate it. In your case upto letter C.

a!localVariables(
  local!alphabet: {
    "a",
    "b",
    "c",
    "d",
    "e",
    "f",
    "g",
    "h",
    "i",
    "j",
    "k",
    "l"
  },
  a!forEach(
    count(local!alphabet) - { enumerate(count(local!alphabet)) + 1 },
    concat(rdrop(local!alphabet, fv!item))
  )
)