<!DOCTYPE html>
<html>
<head>
<title> TABLAS</title>
</head>
<body>
<table border='2'>
<tr>
<th> </th>
<th> Enero</th>
<th> Febrero</th>
<th> Marzo</th>
</tr>
<tr>
<th> Gripe</th>
<td colspan='2'> </td>
<td> </td>
</tr>
<tr>
<th> Tos</th>
<td> </td>
<td colspan='2'> </td>
</tr>
<tr>
<th> Fiebre</th>
<td colspan='3'> </td>
</tr>
</table>
</body>
</html>
