{"trustable":true,"prependHtml":"\u003cscript\u003e window.katexOptions \u003d { disable: true }; \u003c/script\u003e\n\u003cscript type\u003d\"text/x-mathjax-config\"\u003e\n MathJax.Hub.Config({\n tex2jax: {\n inlineMath: [[\u0027$$$\u0027,\u0027$$$\u0027], [\u0027$\u0027,\u0027$\u0027]],\n displayMath: [[\u0027$$$$$$\u0027,\u0027$$$$$$\u0027], [\u0027$$\u0027,\u0027$$\u0027]]\n }\n });\n\u003c/script\u003e\n\u003cscript async src\u003d\"https://mathjax.codeforces.org/MathJax.js?config\u003dTeX-AMS-MML_HTMLorMML\" type\u003d\"text/javascript\"\u003e\u003c/script\u003e","sections":[{"title":"","value":{"format":"HTML","content":"\u003cdiv class\u003d\"panel_content\"\u003e Teacher BoBo is a geography teacher in the school.One day in his class,he marked $N$ points in the map,the $i$-th point is at $(X_i,Y_i)$.He wonders,whether there is a tetrad $(A,B,C,D)(A\u0026lt;B,C\u0026lt;D,A\\neq C or B\\neq D)$ such that the manhattan distance between A and B is equal to the manhattan distance between C and D.\u003cbr\u003e\u003cbr\u003e If there exists such tetrad,print \"YES\",else print \"NO\".\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"First line, an integer $T$. There are $T$ test cases.$(T\\leq 50)$\u003cbr\u003e\u003cbr\u003e In each test case,the first line contains two intergers, N, M, means the number of points and the range of the coordinates.$(N,M\\leq 10^5)$.\u003cbr\u003e\u003cbr\u003e Next N lines, the $i$-th line shows the coordinate of the $i$-th point.$(X_i,Y_i)(0\\leq X_i,Y_i\\leq M)$."}},{"title":"Output","value":{"format":"HTML","content":"$T$ lines, each line is \"YES\" or \"NO\"."}},{"title":"Sample","value":{"format":"HTML","content":"\u003ctable class\u003d\u0027vjudge_sample\u0027\u003e\n\u003cthead\u003e\n \u003ctr\u003e\n \u003cth\u003eInput\u003c/th\u003e\n \u003cth\u003eOutput\u003c/th\u003e\n \u003c/tr\u003e\n\u003c/thead\u003e\n\u003ctbody\u003e\n \u003ctr\u003e\n \u003ctd\u003e\u003cpre\u003e2\r\n3 10\r\n1 1\r\n2 2\r\n3 3\r\n4 10\r\n8 8\r\n2 3\r\n3 3\r\n4 4\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003eYES\r\nNO\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}