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 for phase alternating line
From The Free On-line Dictionary of Computing (30 December 2018) :

  phase alternating line
      (PAL) The video signal format used in the UK
     [where else?].
     PAL uses Amplitude Modulation for the video information, and
     Frequency Modulation for the audio information.  The phase
     of the colour subcarrier is reversed on alternate lines
     which (together with the use of a delay line) allows the
     receiver to cancel any phase errors introduced in the path
     between the studio and the end-user's receiver.  Such phase
     errors are quite common and would cause the displayed colours
     to shift in hue.
     The US equivalent, NTSC, does not have this feature and thus
     requires a user control to correct for transmission phase
     errors, hence the mis-expansion "Never Twice the Same Colour".

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