span> <span class='fu'><a href='https://rdrr.io/r/base/lapply.html'>lapply</a></span>(<span class='fu'>seq_along_rows</span>(<span class='no'>y</span>), <span class='kw'>function</span>(<span class='no'>r</span>) {
    <span class='fu'><a href='https://rdrr.io/r/base/list.html'>list</a></span>(<span class='kw'>x</span> <span class='kw'>=</span> <span class='no'>xs</span>[<span class='no'>r</span>], <span class='kw'>y</span> <span class='kw'>=</span> <span class='no'>ys</span>[<span class='no'>r</span>,], <s