1*02918637SMatthew G. Knepleytetrahedron orientation -12 2*02918637SMatthew G. Knepley\documentclass[tikz]{standalone} 3*02918637SMatthew G. Knepley 4*02918637SMatthew G. Knepley\usepackage{pgflibraryshapes} 5*02918637SMatthew G. Knepley\usetikzlibrary{backgrounds} 6*02918637SMatthew G. Knepley\usetikzlibrary{arrows} 7*02918637SMatthew G. Knepley\begin{document} 8*02918637SMatthew G. Knepley\begin{tikzpicture}[scale = 1.,font=\fontsize{8}{8}\selectfont] 9*02918637SMatthew G. Knepley\path (-1.,-1.,1.) node(4_0) [draw,shape=circle,color=gray] {4}; 10*02918637SMatthew G. Knepley\path (-2.,2.,2.) node(5_0) [draw,shape=circle,color=gray] {5}; 11*02918637SMatthew G. Knepley\path (2.,-2.,2.) node(6_0) [draw,shape=circle,color=gray] {6}; 12*02918637SMatthew G. Knepley\path (-2.,-2.,2.) node(7_0) [draw,shape=circle,color=gray] {7}; 13*02918637SMatthew G. Knepley\path (-2.,-2.,-2.) node(8_0) [draw,shape=circle,color=gray] {8}; 14*02918637SMatthew G. 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