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Explain the four different types of replications

Explain the four different types of replications and the purpose of each. Include for each type of replication a brief original psychological study example (i.e., make up your own) that is different for each type of replication (i.e., do not build on the same example). Plan to devote a short paragraph for each.
Briefly explain how replications relate to the concepts of generalization and external validity.