{"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\"\u003eChiaki has $3n$ points $p_1,p_2,\\dots,p_{3n}$. It is guaranteed that no three points are collinear.\u003cbr\u003eChiaki would like to construct $n$ disjoint triangles where each vertex comes from the $3n$ points.\u003cbr\u003e\u003c/div\u003e"}},{"title":"Input","value":{"format":"HTML","content":"There are multiple test cases. The first line of input contains an integer $T$, indicating the number of test cases. For each test case:\u003cbr\u003eThe first line contains an integer $n$ ($1 \\le n \\le 1000$) -- the number of triangle to construct.\u003cbr\u003eEach of the next $3n$ lines contains two integers $x_i$ and $y_i$ ($-10^9 \\le x_i, y_i \\le 10^9$).\u003cbr\u003eIt is guaranteed that the sum of all $n$ does not exceed $10000$.\u003cbr\u003e"}},{"title":"Output","value":{"format":"HTML","content":"For each test case, output $n$ lines contain three integers $a_i,b_i,c_i$ ($1 \\le a_i,b_i,c_i \\le 3n$) each denoting the indices of points the $i$-th triangle use. If there are multiple solutions, you can output any of them.\u003cbr\u003e"}},{"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\u003e1\r\n1\r\n1 2\r\n2 3\r\n3 5\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003ctd\u003e\u003cpre\u003e1 2 3\r\n\u003c/pre\u003e\u003c/td\u003e\n \u003c/tr\u003e\n\u003c/tbody\u003e\n\u003c/table\u003e\n"}}]}