Found the following HTML validation problems:
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Interface.html:168:1 (Interface.Rd:82): Warning: <h5> anchor "Usage" already defined
Interface.html:180:1 (Interface.Rd:92): Warning: <h5> anchor "Arguments" already defined
Interface.html:225:1 (Interface.Rd:126): Warning: <h5> anchor "Usage" already defined
Interface.html:242:1 (Interface.Rd:141): Warning: <h5> anchor "Arguments" already defined
Interface.html:277:1 (Interface.Rd:170): Warning: <h5> anchor "Returns" already defined
Interface.html:297:1 (Interface.Rd:183): Warning: <h5> anchor "Usage" already defined
Interface.html:312:1 (Interface.Rd:196): Warning: <h5> anchor "Arguments" already defined
Interface.html:339:1 (Interface.Rd:217): Warning: <h5> anchor "Returns" already defined
Interface.html:356:1 (Interface.Rd:226): Warning: <h5> anchor "Usage" already defined
Interface.html:370:1 (Interface.Rd:238): Warning: <h5> anchor "Arguments" already defined
Interface.html:405:1 (Interface.Rd:263): Warning: <h5> anchor "Usage" already defined
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Interface.html:457:1 (Interface.Rd:303): Warning: <h5> anchor "Usage" already defined
Interface.html:470:1 (Interface.Rd:314): Warning: <h5> anchor "Arguments" already defined
Interface.html:503:1 (Interface.Rd:337): Warning: <h5> anchor "Usage" already defined
Interface.html:509:1 (Interface.Rd:341): Warning: <h5> anchor "Arguments" already defined
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Interface.html:585:1 (Interface.Rd:395): Warning: <h5> anchor "Usage" already defined
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Interface.html:607:1 (Interface.Rd:409): Warning: <h5> anchor "Arguments" already defined
Interface.html:630:1 (Interface.Rd:422): Warning: <h5> anchor "Usage" already defined
Interface.html:636:1 (Interface.Rd:426): Warning: <h5> anchor "Arguments" already defined
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Interface.html:699:1 (Interface.Rd:465): Warning: <h5> anchor "Arguments" already defined
Interface.html:724:1 (Interface.Rd:480): Warning: <h5> anchor "Usage" already defined
Interface.html:730:1 (Interface.Rd:484): Warning: <h5> anchor "Arguments" already defined
Interface.html:753:1 (Interface.Rd:497): Warning: <h5> anchor "Usage" already defined
Interface.html:762:1 (Interface.Rd:504): Warning: <h5> anchor "Arguments" already defined
Interface.html:787:1 (Interface.Rd:519): Warning: <h5> anchor "Usage" already defined
Interface.html:793:1 (Interface.Rd:523): Warning: <h5> anchor "Arguments" already defined