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3 added 12 characters in body
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No need even calculations, I would say: On opposite day

"Black"A black cat is not a black cat today"
"5 is not 5"
"True is false"

and normal day

"Black"A black cat is a black cat today"
"5 is 5"
"True is true"

No need even calculations, I would say: On opposite day

"Black cat is not black today"
"True is false"

and normal day

"Black cat is black today"
"True is true"

No need even calculations, I would say: On opposite day

"A black cat is not a black cat today"
"5 is not 5"
"True is false"

and normal day

"A black cat is a black cat today"
"5 is 5"
"True is true"

2 added 39 characters in body
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No need even calculations, I would say: On opposite day

"Black cat is not black today" on opposite day
"True is false"

and normal day

"Black cat is black today" on normal day
"True is true"

No need even calculations, I would say:

"Black cat is not black today" on opposite day

and

"Black cat is black today" on normal day

No need even calculations, I would say: On opposite day

"Black cat is not black today"
"True is false"

and normal day

"Black cat is black today"
"True is true"

1
source | link

No need even calculations, I would say:

"Black cat is not black today" on opposite day

and

"Black cat is black today" on normal day