Extract the names of the islands located on the Eastern Group of the Azores plateau from the text. Separate them with a comma.

Context: These islands can be divided into three recognizable groups located on the Azores Plateau:
The Eastern Group of São Miguel, Santa Maria and Formigas Islets
The Central Group of Terceira, Graciosa, São Jorge, Pico and Faial
The Western Group of Flores and Corvo.

Answer: São Miguel, Santa Maria and Formigas