Closest hex to #c4ff00 is #cf0

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#
#cf0

c4ff00

c4ff00

contains cf

0cf 1cf 2cf 3cf 4cf 5cf 6cf 7cf 8cf 9cf acf bcf ccf cf0 cf1 cf2 cf3 cf4 cf5 cf6 cf7 cf8 cf9 cfa cfb cfc cfd cfe cff dcf ecf fcf

contains f0

0f0 1f0 2f0 3f0 4f0 5f0 6f0 7f0 8f0 9f0 af0 bf0 cf0 df0 ef0 f00 f01 f02 f03 f04 f05 f06 f07 f08 f09 f0a f0b f0c f0d f0e f0f ff0

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