Considering nitroalkanes $\mathrm{R}-\mathrm{NO}{}_2$ and alkyl nitrites $\mathrm{R}-\mathrm{O}-\mathrm{N}=\mathrm{O}$ together, the number of structural isomers of formula $\mathrm{C}{}_3\mathrm{H}{}_7\mathrm{NO}{}_2$ is

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