$\begin{array}{cc}\text{single integral}& \int x\int M\int \frac{x}{o}\int \frac{A}{o}\int \frac{x}{A}\int \frac{A}{M}\int \frac{.}{\mathrm{\text{'}\text{'}}}\\ \text{double integral}& \int \int x\int \int M\int \int \frac{x}{o}\int \int \frac{A}{o}\int \int \frac{x}{A}\int \int \frac{A}{M}\int \int \frac{.}{\mathrm{\text{'}\text{'}}}\\ \text{double nested integral}& \int \int x\int \int M\int \int \frac{x}{o}\int \int \frac{A}{o}\int \int \frac{x}{A}\int \int \frac{A}{M}\int \int \frac{.}{\mathrm{\text{'}\text{'}}}\end{array}$