Closest hex to #56cf03 is #5c0

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#
#5c0

56cf03

56cf03

contains 5c

05c 15c 25c 35c 45c 55c 5c0 5c1 5c2 5c3 5c4 5c5 5c6 5c7 5c8 5c9 5ca 5cb 5cc 5cd 5ce 5cf 65c 75c 85c 95c a5c b5c c5c d5c e5c f5c

contains c0

0c0 1c0 2c0 3c0 4c0 5c0 6c0 7c0 8c0 9c0 ac0 bc0 c00 c01 c02 c03 c04 c05 c06 c07 c08 c09 c0a c0b c0c c0d c0e c0f cc0 dc0 ec0 fc0

contains 50

050 150 250 350 450 500 501 502 503 504 505 506 507 508 509 50a 50b 50c 50d 50e 50f 550 650 750 850 950 a50 b50 c50 d50 e50 f50