''' Purpose: introduce nested looping.
        for a user-supplied n, loop n times where on the r-th iteration,
        the integers from 1 to r are printed out.
'''
# nesting = putting for loops inside for loops
# get n
reply = input( 'Enter number: ' )
n = int( reply )

# performed the repeated printing of a number series
for i in range( 1, n + 1 ) :            # n is the number of rows
    
    # print the numbers from 1 to i
    print( "row", i, end= ": " )        # "stuff; numbers from 1 to", i ) # i is our current row

    for j in range( 1, i+1 ) :          # j is an index (iterator) value; we need i+1
                                        # because ranges are exclusive for the second term

        product = i * j                 # this multiplies the row value i times the column value j
                                        
        print( '(', i, j, product, end=" ) " )
    print()