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214 Journal of Library Science in China, Vol.13, 2021
Figure 2. Absolutely Essential diagram: the tricarboxylic acid cycle
Furthermore, the periodic table is fundamental to the core knowledge of chemistry and is
indispensable, making it an absolutely essential diagram. In contrast, something similar, like the
amino acid cycle diagram, falls into the “better to have than not” category, making it a relatively
essential diagram, as shown in Figure 3.
Figure 3. Relatively Essential Diagram: Amino Acid Table
