OpenEuphoria: Forum: Grid in vlookup

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In the manual for vlookup at https://openeuphoria.org/docs/std_search.html#_2518_lookup, we see an example of a grid.

grid = { 
       {"ant", "spider", "mortein"}, 
       {"bear", "seal", "gun"}, 
       {"cat", "dog", "ranger"}, 
       $ 
 }

What is the purpose of "$" on the last line? It is not described; and it doesn't seem to make any difference if it's there or not.

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