Two words are $m$-equivalent if the corresponding paths terminate at level $m$ at the same vertex and coincide from level $m+1$ to $n$.
These results show that an analysis purely at the level of functions cannot be useful for describing ......
The vector field $H$ always points towards the higher $A$-level.
The temperature has to be maintained at a very high level.
Inflation in the first quarter rose beyond the acceptable level of 5%.
The level of ...... has remained largely unchanged for many years.
Prewar levels of production were surpassed in 1929.
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