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: :
(1) What is the symbol of period 4?
(2) What is the symbol of period 3?
(3) What is the symbol of period 3?
(4) What is the symbol of period 3?
(5) What is the symbol of period 4?
(6) What is the symbol of period 2?
(7) What is the symbol of period 1?
(8) What is the symbol of period 3?
(9) What is the symbol of period 3?
(10) What is the symbol of period 2?