An expression in Cypher can be:
13, 40000, 3.14.
"Hello", 'World'.
true, false, TRUE, FALSE.
n, x, rel, myFancyIdentifier, `A name with weird stuff in it[]!`.
n.prop, x.prop, rel.thisProperty, myFancyIdentifier.`(weird property name)`.
n.prop?, rel.thisProperty!.
{param}, {0}
["a", "b"], [1,2,3], ["a", 2, n.property, {param}], [ ].
length(p), nodes(p).
avg(x.prop), count(*).
:REL_TYPE, :`REL TYPE`, :REL1|REL2.
a-->()<--b.
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