
    Design a function for the adaptive geometry module that calculates the visible surface area of a digital learning cube, excluding its top and bottom faces, to determine the next difficulty level for a student's personalized learning path. The function should take the current challenge cube's side length as input and compute only the area of the four lateral faces that are visible to the student during the interactive exercise.
    

    
def lateralsurface_cube(l):
    """
    Design a function for the adaptive geometry module that calculates the visible surface area of a digital learning cube, excluding its top and bottom faces, to determine the next difficulty level for a student's personalized learning path. The function should take the current challenge cube's side length as input and compute only the area of the four lateral faces that are visible to the student during the interactive exercise.
    

    """
def lateralsurface_cube(l):
    """
    Design a function for the adaptive geometry module that calculates the visible surface area of a digital learning cube, excluding its top and bottom faces, to determine the next difficulty level for a student's personalized learning path. The function should take the current challenge cube's side length as input and compute only the area of the four lateral faces that are visible to the student during the interactive exercise.
    

    """
    LSA = 4 * (l * l)
    return LSA