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LaTeX Font Info: Checking defaults for OML/cmm/m/it on input line 4. LaTeX Font Info: ... okay on input line 4. LaTeX Font Info: Checking defaults for OMS/cmsy/m/n on input line 4. LaTeX Font Info: ... okay on input line 4. LaTeX Font Info: Checking defaults for OT1/cmr/m/n on input line 4. LaTeX Font Info: ... okay on input line 4. LaTeX Font Info: Checking defaults for T1/cmr/m/n on input line 4. LaTeX Font Info: ... okay on input line 4. LaTeX Font Info: Checking defaults for TS1/cmr/m/n on input line 4. LaTeX Font Info: ... okay on input line 4. LaTeX Font Info: Checking defaults for OMX/cmex/m/n on input line 4. LaTeX Font Info: ... okay on input line 4. LaTeX Font Info: Checking defaults for U/cmr/m/n on input line 4. LaTeX Font Info: ... okay on input line 4. 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See the pgfkeys package documentation for explanation. Type H for immediate help. ... l.19 \node[variable] (ntotal) {$N_{total} = 730$}; This error message was generated by an \errmessage command, so I can't give any explicit help. Pretend that you're Hercule Poirot: Examine all clues, and deduce the truth by order and method. LaTeX Font Info: External font `cmex10' loaded for size (Font) <7> on input line 19. LaTeX Font Info: External font `cmex10' loaded for size (Font) <5> on input line 19. d:/XHJ/mathmo/MCM2026/20260116/vscode/picture.tex:20: Package pgfkeys Error: The key '/tikz/variable' requires a value. I am going to ignore this key. See the pgfkeys package documentation for explanation. Type H for immediate help. ... l.20 \node[variable, below=of ntotal] (kbase) {$k_{base} \in [5, 10]$}; (That was another \errmessage.) LaTeX Font Info: External font `cmex10' loaded for size (Font) <9> on input line 23. LaTeX Font Info: External font `cmex10' loaded for size (Font) <6> on input line 23. d:/XHJ/mathmo/MCM2026/20260116/vscode/picture.tex:26: Package pgfkeys Error: The key '/tikz/variable' requires a value. I am going to ignore this key. See the pgfkeys package documentation for explanation. Type H for immediate help. ... l.26 \node[variable, right=of nfree] (kie) { (That was another \errmessage.) d:/XHJ/mathmo/MCM2026/20260116/vscode/picture.tex:27: Undefined control sequence. l.27 $k_{i_e} = k_{base} + \text {round}\left(N_{free} \cdot \frac{D_... The control sequence at the end of the top line of your error message was never \def'ed. If you have misspelled it (e.g., `\hobx'), type `I' and the correct spelling (e.g., `I\hbox'). Otherwise just continue, and I'll forget about whatever was undefined. d:/XHJ/mathmo/MCM2026/20260116/vscode/picture.tex:40: Package pgfkeys Error: The key '/tikz/variable' requires a value. I am going to ignore this key. See the pgfkeys package documentation for explanation. Type H for immediate help. ... l.40 \node[variable, left=of score] (gini) { (That was another \errmessage.) d:/XHJ/mathmo/MCM2026/20260116/vscode/picture.tex:63: Package pgfkeys Error: I do not know the key '/tikz/fit', to which you passed '(ntotal) (kbase) (kie)', and I am going to ignore it. Perhaps you misspelled it. See the pgfkeys package documentation for explanation. Type H for immediate help. ... l.63 ... (fairbox) [fit=(ntotal) (kbase) (kie)] {}; (That was another \errmessage.) d:/XHJ/mathmo/MCM2026/20260116/vscode/picture.tex:67: Package pgfkeys Error: I do not know the key '/tikz/fit', to which you passed '(eff) (score) (gini) (judge)', and I am going to ignore it. Perhaps you misspelled it. See the pgfkeys package documentation for explanation. Type H for immediate help. ... l.67 ...effbox) [fit=(eff) (score) (gini) (judge)] {}; (That was another \errmessage.) 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