Exponential moving average start

#1
Suppose I've 50 new closing data points with no older data. I wish to calculate a 19 period EMA for the entire set. I know the formula but don't understand where to start the calculations.

There seems to be several alternatives:

1)start with the first data point
2) start with the SMA of the first 19 data points at point 19
3) start at the 19th data point
4) start at the 10th data point using the mean of the 19 data

Which of these should I use? Does it matter how I start after a while?
 

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