[tag=NNS] [tag="-RRB-"] [lemma=","] [lemma=□]
[tag=NNS] [tag="-RRB-"] [lemma=","] [lemma=and]
[tag=NNS] [tag="-RRB-"] [lemma=","] [lemma=","]
This removes attribute / element patterns with empty name classes , empty patterns in group / interleave , notAllowed patterns ( except the start pattern and defined patterns ) , and data patterns with empty languages . Variables in upper case are class variables ( static variables ) , and variables in lower case are generally temporary variables that have either been passed into the method or defined within the current block . Of the 108 who answered the question , about a third ( 32 % ) would like more trails , 14 % would like more interpretive signs , 12 % would like more staff interpretation ( staffed booth , guided hikes , interpretive talks ) , and 9 % would like more facilities for the disabled , such as paved paths for wheelchairs . Several commonly used techniques were discussed : usability studies , " good citizen metrics " for contributors to the collection ( in a commercial organization , sometimes accompanied by a carrot-and-stick approach to encouraging quality contributions ) , and transaction log analysis . I understood Tom 's original post to say that he was including firm and year fixed effects ( firm effects via use of - xtreg - and year effects via a set of indicator variables ) , and was clustering on firm to allow arbitrary serial correlation of errors within panel , but was concerned about the implications of the cluster ( ) option for a downstream test , which question Mark answered quickly . If you have any suspicions I urge you to take any necessary emergency action and to seek urgent telephone advice from an expert ( see following advice and list of contacts ) , and refer the case as required .