The way modules work in Mathematica is basically very simple. Every time any module is used, a new symbol is created to represent each of its local variables. The new symbol ...
Order
(Built-in Mathematica Symbol) Order[expr_1, expr_2] gives 1 if expr_1 is before expr_2 in canonical order, and -1 if expr_1 is after expr_2 in canonical order. It gives 0 if expr_1 is identical to expr_2.
UnsameQ
(Built-in Mathematica Symbol) lhs =!= rhs yields True if the expression lhs is not identical to rhs, and yields False otherwise.
SokalSneathDissimilarity[u, v] gives the Sokal\[Dash]Sneath dissimilarity between Boolean vectors u and v.
ExportAutoReplacements is an option for cells that specifies which replacement rules Mathematica automatically applies when exporting text.
ImportAutoReplacements is an option for cells that specifies which replacement rules Mathematica automatically applies when importing text.
CellBracketOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for cells that specifies settings for cell brackets.
RogersTanimotoDissimilarity[u, v] gives the Rogers\[Dash]Tanimoto dissimilarity between Boolean vectors u and v.
TemperedChromatic is an interval list corresponding to an equal tempered scale.
DiceDissimilarity[x, y] gives the Dice dissimilarity between Boolean vectors x and y.