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based on an earlier version of the Wolfram Language.
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RuleDelayed

lhs:>rhs or lhs⧴rhs
represents a rule that transforms lhs to rhs, evaluating rhs only after the rule is used.
  • You can apply rules using Replace.
  • The assignment lhs:=rhs specifies that the rule lhs:>rhs should be used whenever it applies.
  • You can use Condition to specify when a particular rule applies.
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