$\backslash$table$[[,$Immediate,$],[$Activity$,$Designation,,Predecessor,Time in Days$],[$Break down both machines,A$,$None,$3,],[$Clean machine $1,$B$,$A$,2,],[$Clean machine $2,$C$,$A$,4,],[$Re$-$set machine $1,$D$,$B$,3,],[$Re$-$set machine $2,$E$,$C$,2,],[$Re$-$calibrate both machines,F$,$D and E$,2,],[$Final test,G$,$F$,4,]]$

ABDG

ACEG

ACDFG

ACEFG

ABDFG