#Paul A. Gagniuc. An Introduction to Programming Languages: Simultaneous Learning in Multiple Coding Environments. Synthesis Lectures on Computer Science. Springer International Publishing, 2023, pp. 1-280.
#Additional algorithm 26. It demonstrates the use of nested for-loops. It shows the traversal of a two-dimensional array by a nested for-loop structure. A 2D-array variable (A) is declared with mixed datatypes, namely with string literals and number literals. A string variable t is initially set to empty. Another two variables (ie. i and j) are initialized with value zero and are the main counters of nested for-loops. The upper limit of each for-loop is established by the two dimensions, namely the number of rows and columns from matrix A. The two for-loops traverse the elements of array A by using the counters i and j as an index. At each iteration, the value from an element is added to the content of variable t. Once the end of the nested for-loops is reached, the value collected in variable t is printed in the output for inspection. The end result is the enumeration of each value in the output, in a linear manner. Note that the source code is in context and works with copy/paste.

A = [["a", 88, 146],
     ["b", 34, 124],
     ["c", 96, 564],
     [100, 12, "d"]]

t = ""

for i in range(0, len(A)):
    for j in range(0, len(A[i])):
        t += "\n A[" + str(i) + "]["
        t += str(j) + "]=" + str(A[i][j])

print(t)