Question 1010073
<table border=1 cellpadding=5><tr><th>Number</th><th>Statement</th><th>Lines Used</th><th>Reason</th></tr><tr><td>1</td><td>H -&gt; U</td><td></td><td></td></tr><tr><td>:.</td><td>H -&gt; (U v T)</td><td></td><td></td></tr><tr><td>2</td><td>~H v U</td><td>1</td><td>Material Implication</td></tr><tr><td>3</td><td>(~H v U) v T</td><td>2</td><td>Addition</td></tr><tr><td>4</td><td>~H v (U v T)</td><td>3</td><td>Association</td></tr><tr><td>5</td><td>H -&gt; (U v T)</td><td>4</td><td>Material Implication</td></tr></table>