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Please help me to do a Gantt chart. and if you can please insert the chart so i know what it looks like.

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$\backslash$table$[[$Activity$,$immediate predecessors,expected time$],[$A$,-,10],[$B$,$A$,$D$,12],[$C$,$B$,9],[$D$,-,5],[$E$,$D$,$G$,7],[$F$,$E$,6],[$G$,-,3],[$H$,$G$,4],[$I$,$H$,6]]$