<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def prepare_table(table):
 """Make the table 'symmetric' where the lower left part of the matrix is the reverse probability """

    n = len(table)
    for i, row in enumerate(table):
        assert len(row) == n
        for j, el in enumerate(row):
            if i == j:
                table[i][i] = 0.0
            elif i > j:
                table[i][j] = 1-table[j][i]
    return table