Found the following HTML validation problems:
ASTBranch.html:168:1 (ASTBranch.Rd:94): Warning: missing </ul> before </div>
ASTBranch.html:116:1 (ASTBranch.Rd:66): Warning: <h5> anchor "Usage" already defined
ASTBranch.html:145:1 (ASTBranch.Rd:83): Warning: <h5> anchor "Usage" already defined
ASTBranch.html:151:1 (ASTBranch.Rd:87): Warning: <h5> anchor "Arguments" already defined
ASTFunction.html:134:1 (ASTFunction.Rd:76): Warning: <h5> anchor "Usage" already defined
ASTFunction.html:150:1 (ASTFunction.Rd:86): Warning: <h5> anchor "Usage" already defined
ASTFunction.html:166:1 (ASTFunction.Rd:96): Warning: <h5> anchor "Usage" already defined
ASTFunction.html:182:1 (ASTFunction.Rd:106): Warning: <h5> anchor "Usage" already defined
ASTFunction.html:188:1 (ASTFunction.Rd:110): Warning: <h5> anchor "Arguments" already defined
ASTFunction.html:211:1 (ASTFunction.Rd:123): Warning: <h5> anchor "Usage" already defined
ASTFunction.html:217:1 (ASTFunction.Rd:127): Warning: <h5> anchor "Arguments" already defined
ASTMultiply.html:133:1 (ASTMultiply.Rd:77): Warning: <h5> anchor "Usage" already defined
ASTMultiply.html:149:1 (ASTMultiply.Rd:87): Warning: <h5> anchor "Usage" already defined
ASTMultiply.html:165:1 (ASTMultiply.Rd:97): Warning: <h5> anchor "Usage" already defined
ASTMultiply.html:181:1 (ASTMultiply.Rd:107): Warning: <h5> anchor "Usage" already defined
ASTMultiply.html:187:1 (ASTMultiply.Rd:111): Warning: <h5> anchor "Arguments" already defined
ASTNode.html:219:1 (ASTNode.Rd:118): Warning: missing </ul> before </div>
ASTNode.html:106:1 (ASTNode.Rd:53): Warning: <h5> anchor "Usage" already defined
ASTNode.html:122:1 (ASTNode.Rd:63): Warning: <h5> anchor "Usage" already defined
ASTNode.html:138:1 (ASTNode.Rd:73): Warning: <h5> anchor "Usage" already defined
ASTNode.html:167:1 (ASTNode.Rd:90): Warning: <h5> anchor "Usage" already defined
ASTNode.html:173:1 (ASTNode.Rd:94): Warning: <h5> anchor "Arguments" already defined
ASTNode.html:196:1 (ASTNode.Rd:107): Warning: <h5> anchor "Usage" already defined
ASTNode.html:202:1 (ASTNode.Rd:111): Warning: <h5> anchor "Arguments" already defined
ASTPlus.html:130:1 (ASTPlus.Rd:76): Warning: <h5> anchor "Usage" already defined
ASTPlus.html:146:1 (ASTPlus.Rd:86): Warning: <h5> anchor "Usage" already defined
ASTPlus.html:162:1 (ASTPlus.Rd:96): Warning: <h5> anchor "Usage" already defined
ASTPlus.html:168:1 (ASTPlus.Rd:100): Warning: <h5> anchor "Arguments" already defined
ASTTableFormula.html:128:1 (ASTTableFormula.Rd:74): Warning: <h5> anchor "Usage" already defined
ASTTableFormula.html:144:1 (ASTTableFormula.Rd:84): Warning: <h5> anchor "Usage" already defined
ASTTableFormula.html:160:1 (ASTTableFormula.Rd:94): Warning: <h5> anchor "Usage" already defined
ASTTableFormula.html:166:1 (ASTTableFormula.Rd:98): Warning: <h5> anchor "Arguments" already defined
ASTVariable.html:82:1 (ASTVariable.Rd:49): Warning: <h3> anchor "Methods" already defined
ASTVariable.html:163:1 (ASTVariable.Rd:95): Warning: <h5> anchor "Usage" already defined
ASTVariable.html:179:1 (ASTVariable.Rd:105): Warning: <h5> anchor "Usage" already defined
ASTVariable.html:195:1 (ASTVariable.Rd:115): Warning: <h5> anchor "Usage" already defined
ASTVariable.html:211:1 (ASTVariable.Rd:125): Warning: <h5> anchor "Usage" already defined
ASTVariable.html:217:1 (ASTVariable.Rd:129): Warning: <h5> anchor "Arguments" already defined
ASTVariable.html:240:1 (ASTVariable.Rd:142): Warning: <h5> anchor "Usage" already defined
ASTVariable.html:246:1 (ASTVariable.Rd:146): Warning: <h5> anchor "Arguments" already defined
Parser.html:134:1 (Parser.Rd:71): Warning: <h5> anchor "Usage" already defined
Parser.html:163:1 (Parser.Rd:88): Warning: <h5> anchor "Usage" already defined
Parser.html:179:1 (Parser.Rd:98): Warning: <h5> anchor "Usage" already defined
Parser.html:195:1 (Parser.Rd:108): Warning: <h5> anchor "Usage" already defined
Parser.html:211:1 (Parser.Rd:118): Warning: <h5> anchor "Usage" already defined
Parser.html:227:1 (Parser.Rd:128): Warning: <h5> anchor "Usage" already defined
Parser.html:243:1 (Parser.Rd:138): Warning: <h5> anchor "Usage" already defined
Parser.html:259:1 (Parser.Rd:148): Warning: <h5> anchor "Usage" already defined
Parser.html:275:1 (Parser.Rd:158): Warning: <h5> anchor "Usage" already defined
Parser.html:291:1 (Parser.Rd:168): Warning: <h5> anchor "Usage" already defined
Parser.html:307:1 (Parser.Rd:178): Warning: <h5> anchor "Usage" already defined
Parser.html:313:1 (Parser.Rd:182): Warning: <h5> anchor "Arguments" already defined
Parser.html:336:1 (Parser.Rd:195): Warning: <h5> anchor "Usage" already defined
Parser.html:342:1 (Parser.Rd:199): Warning: <h5> anchor "Arguments" already defined
Token.html:130:1 (Token.Rd:67): Warning: missing </ul> before </div>
Token.html:107:1 (Token.Rd:56): Warning: <h5> anchor "Usage" already defined
Token.html:113:1 (Token.Rd:60): Warning: <h5> anchor "Arguments" already defined
html5.html:54:1 (html5.Rd:14): Warning: missing </ul> before </div>
nejm_range.html:54:1 (nejm_range.Rd:14): Warning: missing </ul> before </div>
proc_tab.html:66:1 (proc_tab.Rd:20): Warning: missing </ul> before </div>
rowscols.html:54:1 (rowscols.Rd:19): Warning: missing </ul> before </div>
standard_difference.html:62:1 (standard_difference.Rd:18): Warning: missing </ul> before </div>
table_builder.html:138:1 (table_builder.Rd:100): Warning: missing </ul> before </div>