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[null,"Group","Task","Start","Duration"]
[null,"A","Preparation","2020-01-31",90]
[null,null,"Design","2020-02-28",30]
[null,"B","Bidding","2020-03-31",45]
[null,null,"Building","2020-02-28",91]
[null,null,"Implementation","2020-07-02",170]
[null,"C","Something","2020-09-01",30]
[null,"A","Audit","2020-10-15",21]
[null,null,"Acceptance","2020-12-30",3]

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[]
[null,"Group","Red","Green","Blue","Comments"]
[null,"A",217,83,79,"Responsible: John Smith."]
[null,"B",92,184,92]
[null,"C",2,117,216,"Responsible: Mary Jane."]