${\displaystyle {\ce {\mathsf {H-C\equiv C-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-{\overset {\displaystyle H \atop |}{\underset {| \atop \displaystyle H}{C}}}-H}}}}$

<ce>H-C \equiv C- \overset{\displaystyle H \atop | }{\underset{ | \atop \displaystyle H}{C} }- \overset{\displaystyle H \atop | }{\underset{ | \atop \displaystyle H}{C} }- H</ce>

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