Closest hex to #778899 is #789

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#
#789

778899

778899

contains 78

078 178 278 378 478 578 678 778 780 781 782 783 784 785 786 787 788 789 78a 78b 78c 78d 78e 78f 878 978 a78 b78 c78 d78 e78 f78

contains 89

089 189 289 389 489 589 689 789 889 890 891 892 893 894 895 896 897 898 899 89a 89b 89c 89d 89e 89f 989 a89 b89 c89 d89 e89 f89

contains 79

079 179 279 379 479 579 679 779 790 791 792 793 794 795 796 797 798 799 79a 79b 79c 79d 79e 79f 879 979 a79 b79 c79 d79 e79 f79