A stem and leaf diagram is drawn by splitting the tens and units column.
The tens column becomes the 'stem' and the units become the 'leaf'.
The leaf must only contain single digits.
They must be ordered and there must be a key. (e.g. 13|4 = 134)
Back to back stem and leaf diagrams contain two leaf columns (one on either side of the stem) and therefore require two keys.
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