X by teebee(pooq)

m:-readln([N]),N/I,M is N-I+1,X is max(I,M),(X/J,((J=I;J=M)-> \+put(88);\+put(32));\+nl).
N/I:-between(1,N,I).

Note that non-ascii characters in the above source code will be escaped (such as \x9f).

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