Munis are commonly issued as serial bonds with maturity dates occurring at regular intervals until the entire issue is paid back. 

Serial bonds have different interest rates for each maturity and generally offer investors more variation in their investments. 

Munis may also be issued in the form of term bonds, which is a series of bonds that matures on a single date. Term bonds typically have longer maturity dates and can be issued alongside serials bonds in the same deal or by themselves.

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