  Simplification of expressions in computer algebra systems often involves a
step known as "canonicalisation", which reduces equivalent expressions to the
same form. However, such forms may not be natural from the perspective of a
pen-and-paper computation, or may be unwieldy, or both. This is, for example,
the case for expressions involving tensor multi-term symmetries. We propose an
alternative strategy to handle such tensor expressions, which hides canonical
forms from the user entirely, and present an implementation of this idea in the
Cadabra computer algebra system.
