Behavioral Capacitor & Behavioral Inductor

Hi,

I see that in QSPICE there is available Behavioral Resistor, but I do not see that Behavioral Capacitor and Behavioral Inductor available. Why? There is no need for these like kind of components? If someone needs these kind of components what he/she can do then? Can be created somehow in other way Behavioral Capacitor & Behavioral Inductor?
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