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Guidance
Coronavirus (COVID-19): safer travel guidance for passengers
Walking, cycling, and travelling in vehicles or on public transport during the coronavirus outbreak.

Published 12 May 2020
Last updated 3 July 2020 — see all updates
From:
Department for Transport
Applies to:
England (see guidance for Wales, Scotland, and Northern Ireland)

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IgnoredAmbience

Extracting PDF Files to Images

PDF files that contain a single image are often a pain to work with, but it is simple to extract that image using pdfimages.

First, run pdfimages with the list command to check the document is composed of a single image:

$ pdfimages -list file.pdf
page   num  type   width height color comp bpc  enc interp  object ID x-ppi y-ppi size ratio
--------------------------------------------------------------------------------------------
   1     0 image    3508  2480  rgb     3   8  jpeg   no         8  0   300   300  409K 1.6%

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Problem

When setting GetIt dependencies on a project, Emarcadero Delphi 10.2 Tokyo will fail the build with this error:

Project [...] (Make target(s)):
Target _CheckGetItPackageDependencies:
    Target _ExecGetItCmd:
        c:\program files (x86)\embarcadero\studio\19.0\bin\CodeGear.Common.Targets : warning : Checking GetIt package dependencies
        c:\program files (x86)\embarcadero\studio\19.0\bin\CodeGear.Common.Targets(305,5): error MSB4018: The "GetItCmd" task failed unexpectedly.
        c:\program files (x86)\embarcadero\studio\19.0\bin\CodeGear.Common.Targets(305,5): error MSB4018: System.NullReferenceException: Object reference not set to an instance of an object.
        c:\program files (x86)\embarcadero\studio\19.0\bin\CodeGear.Common.Targets(305,5): error MSB4018:    at Borland.Build.Tasks.Common.CommandLineTask.Execute()

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IgnoredAmbience

• Walking Directions
• Side-events
  • Formal Methods Meets JavaScript Meeting
  • An Evening with TC39 in London meeting
• Transport
  • Public Transport
  • Airports
  • Taxis/Driving
  • Cycling
• Hotels

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docker system prune -a

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How to register a personal device on the wired network at Imperial College London

Useful if your machine's OS isn't pre-loaded with an Operating System with a web-browser(!)

Alternatively, you can contact ICT self-service.

Information required:

• IP address of device (as assigned by the pre-registration network, 172.nnn.nnn.nnn, IP_ADDRESS in the below command)
• MAC Address of device (xx:xx:xx:xx:xx:xx, MAC_ADDRESS in the below command)
• Your college username and password (USER_NAME below, you will be prompted for the password)

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(** Conversion between integers and unicode \mathbb strings *)
(* 0-9 as unicode \mathbb{d} multibyte character strings *)
let ustr_bb_digits =
  Array.init 10 (fun i -> Printf.sprintf "\xf0\x9d\x9F%c" (char_of_int (0x98 + i)))

(** Converts an integer into an array of decimal digits *)
let int_to_array i =
  let rec f i acc = if i == 0 then acc else f (i/10) (i mod 10 :: acc) in
  f i []