Practicing Success
Select the combination of letters that when sequentially placed in the blanks of the given series, will complete the series. S P_ _ _P S T S_ _ _S P S_ |
P S S P P S S T S S P T S S S T S P S T T P S T S P T T |
S T S P S T T |
S P / S T / S P / S T / S P / S T / S P / S T S T S P S T T
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