Given the following sales data:

Year $1,$ Spring: $103$

Year $1,$ Summer: $44$

Year $1,$ Fall: $72$

Year $1,$ Winter: $21$

Year $2,$ Spring: $104$

Year $2,$ Summer: $47$

Year $2,$ Fall: $68$

Year $2,$ Winter: $21$

Forecast sales for Spring, Year $3.$

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