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Re:An evidence based guide to anxiety in autism [pdf] by hyperman1 on Friday April 26, 2019 @04:45PM (#19761582)
Neither can I. linux's file identifies it as PDF document, version 1.4, but KDE's okular says:

Syntax Error: Invalid XRef entry Internal Error: xref num 229 not found but needed, try to reconstruct<0a> Syntax Error: Invalid XRef entry Syntax Error: Top-level pages object is wrong type (null) Command Line Error: Wrong page range given: the first page (1) can not be after the last page (0).

Seems like it is damaged but some readers deal better with it than others

Re:An evidence based guide to anxiety in autism [pdf] by bp0017 on Friday April 26, 2019 @06:08PM (#19762181)
Doesn't work on Acrobat, Win 10 either