⟨
⟨ ...
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Starts a list. Inner elements must be separated by , or ⋄. Lists can be nested in other lists.
,
⋄
Must end with a corresponding ⟩.
⟩
⟨1, 2, 3⟩ ⟨ 1 2 3 ⟩ ⟨+ ⋄ - ⋄ 56⟩ ⟨ + - 56 ⟩