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=REPLACE(A1,4,3-LEN(MID(A1,4,2)*10),"-")
=REPLACE(A1,4,3,TEXT(MID(A1,4,3),"-#"))

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145012STM¡@¡Ö¡@145-12STM
145243STM¡@¡Ö¡@145-243STM

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