'period'>.</span><span class='id identifier rubyid_flatten'>flatten</span>
    <span class='period'>.</span><span class='id identifier rubyid_compact'>compact</span>
    <span class='period'>.</span><span class='id identifier rubyid_reject'>reject</span> <span class='lbrace'>{</span> <span class='op'>|</span><span class='id identifier rubyid_association'>association</span><span class='op'>|</span> <span class='id identifier rubyid_association'>association</span><span class='lbracket'>[</span><span class='sy