PS
# parallel-series.m4
# https://tex.stackexchange.com/questions/709074/how-to-plot-a-block-diagram-with-tikz
cct_init

dot; line right_ dimen_/2
parallel_(
  parallel_(
    `ebox(,wdth=0.2;text="$x_1$")',
    `Sep=dimen_*3/4;ebox(,wdth=0.2;text="$x_2$")'),
  Sep=dimen_;series_(
    `ebox(,wdth=0.2;text="$x_3$")',
    `ebox(,wdth=0.2;text="$x_4$")'))
line right_ dimen_/2; dot
PE

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