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$O = 19, $C = ~$C& 0x4D; # bits 7+ all 0
$O = 20, $C = ~$C| 0x20; # bits 7+ all 1
...
$O = 22, $C =  $C&~0x6F; # bits 7+ all 0      00?0000
$O = 23, $C = ~$C| 0x73; # bits 7+ all 1      1111111
$O = 24, $C =  $C^~0x74; # bits 7+ all 0      1110100

# 0 4294967295 105  8 4294967263  73  8 4294967263  77  4 4294967291  
+53
# 0 4294967295 116 20 4294967263 112 13 4294967282 125 16 4294967295 1
+16