=MIN(IF(A1<>"",A1,DATE(9999,12,31)),IF(A3<>"",A3,DATE(9999,12,31)),IF(A5<>"",A5,DATE(9999,12,31)),IF(B2<>"",B2,DATE(9999,12,31)),IF(B4<>"",B4,DATE(9999,12,31)))
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