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Scale systems vary between regions , there are diatonic scales , but other forms , e.g . In authorising travel for an employee where a period of driving is involved , the supervisor shall ensure that the driving and accommodation requirements comply with this policy and accompanying guidelines . Those working or studying in laboratory and health care settings who follow universal infection control procedures are extremely unlikely to contract HIV or hepatitis . In addition , while lexical ( `` my '' or `` temporary '' ) variables disappear after each invocation of a Perl module rule via mod_perl , global variables stick around across invocations . " But most times , he said , because those who are typically suicidal have an incredibly difficult time sharing their pain , the signs are much more subtle .