"The given string is a 2D plane of random length consisting of two characters" is incorrect; "2D plane" to descibe a 1D string, "random length consisting of two characters" to describe non-fixed length of chars from a set of two chars.
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"The given string is a 2D plane of random length consisting of two characters" is incorrect;
"2D plane" to descibe a 1D string,
"random length consisting of two characters" to describe non-fixed length of chars from a set of two chars.