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Brent Kerby calls out that ‘take’, ‘cat’, and ‘i’ are a linear basis in a concatenative language.
The Theory of Concatenative Combinators » Linear Completeness
[B] [A] take == [A [B]]
[B] [A] cat == [B A]
[A] i == A
This is a valid basis because ‘take’ covers quoting, concatenation, and reording; ‘cat’ covers concatenation; and ‘i’ covers unquoting. (Note that concatenation is covered twice, which is why there is a possible two-instruction basis.)
Categories of instructions in a concatenative basis