The .LIST command specifies the beginning of a list by resetting
    the left margin farther to the right, by setting a .SKIP command
    value to take effect before each item in the list, and by
    executing .TEST PAGE. Use the .LIST ELEMENT command to specify
    each item in the list. .LIST ELEMENT commands also give you
    numbers or letters in sequence in the left margin or let you
    substitute a single character of your choice for each of the
    numbers or letters (for example, the lowercase letter o, which
    is known as a "bullet"). (See also .DISPLAY ELEMENTS and .NUMBER
    LIST.)

    The .END LIST command ends a list, restoring any fill, justify,
    case, margin, or spacing settings that were in effect before you
    entered the most recent .LIST command. You can also specify a
    value with .END LIST that puts blank lines after the last item in
    the list (as with .SKIP).

    Formats

      .LIST  [[-]n] ["x"]

      .END LIST  [[-]n]

      .LIST  [[-]n] ['x']

      .END LIST  [[-]n]

    Abreviated formats

      .LS  [[-]n] ["x"]

      .ELS  [[-]n]

      .LS  [[-]n] ['x']

      .ELS  [[-]n]

1  –  Parameters

 n

    With .LIST, specifies the number of blank lines to appear before
    each item. Each blank line can result in additional blank lines
    if the .SPACING setting is greater than 1. (See .SKIP n.)

    With .END LIST, behaves the same as n with .LIST, however, the
    blank lines appear after the final item in the current list.

 -n

    With .LIST, pushes the next line of list text to within n lines
    of the bottom of the current page by inserting blank lines. (See
    .SKIP -n and .BLANK -n.)

    With .END LIST, pushes the next line of current list text to
    within n lines of the bottom of the current page by inserting
    blank lines. (See .SKIP -n and .BLANK -n.)

 "x"

    A character enclosed in quotation marks ("x") or apostrophes
    ('x') that you can specify to appear at the beginning of each
    list item.

2  –  Defaults

    o  If you omit n from either .LIST or .END LIST, you get the
       .SKIP value associated with .PARAGRAPH or .SET PARAGRAPH or 1
       (if you have not specified such a value).

    o  If you omit "x," you get a sequence of decimal numbers
       beginning with 1, or you get another kind of sequence if you
       enter the .DISPLAY ELEMENTS command after the .LIST.