\leftarrow, \Leftarrow, \rightarrow, \Rightarrow, \leftrightarrow, \Leftrightarrow, \mapsto, \hookleftarrow, \leftharpoonup, \leftharpoondown, \rightleftharpoons, \longleftarrow, \longrightarrow, \Longrightarrow, \longleftrightarrow, \Longleftrightarrow, \longmapsto, \hookrightarrow, \rightharpoonup, \righttharpoondown, \uparrow, \Uparrow, \downarrow, \Downarrow, \updownarrow, \Updownarrow, \nearrow, \nwarrow, \searrow, \swarrow, \buildrel, \alpha, \beta, \over, \rm, $