-right:10px;" onclick="edit('ch6ex3');" href="#" id="buttonsolve">
        <i id="ch6ex3" class="far fa-edit" style="color:white"></i>
        </button>
        </a>
    </div>
    <div class="card-body">
        <p class="card-text">

Consider the problem of <a href="#footnote1">constructing</a> (not solving)
crossword puzzles fitting words into a rectangular grid. The grid,
which is given as part of the problem, specifies which squares are blank
and which are shaded. Assume that a list of words (i.e., a d