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    valign_type -- 'top', 'middle', 'bottom', 'relative'
    valign_amount -- a percentage when align_type=='relative'
    height_type -- 'given', 'relative', 'clip'
    height_amount -- a percentage when width_type=='relative'
        otherwise equal to the height of the widget
    min_height -- a desired minimum width for the widget or None
    top -- a fixed number of rows to fill on the top
    bottom -- a fixed number of rows to fill on the bottom

    >>> ctbf = calculate_top_bottom_filler
    >>> ctbf(15, 'top', 0, 'given', 10, None, 2, 0)
    (2, 3)
    >>> ctbf(15, 'relative', 0, 'given', 10, None, 2, 0)
    (2, 3)
    >>> ctbf(15, 'relative', 100, 'given', 10, None, 2, 0)
    (5, 0)
    >>> ctbf(15, 'middle', 0, 'given', 4, None, 2, 0)
    (6, 5)
    >>> ctbf(15, 'middle', 0, 'given', 18, None, 2, 0)
    (0, 0)
    >>> ctbf(20, 'top', 0, 'relative', 60, None, 0, 0)
    (0, 8)
    >>> ctbf(20, 'relative', 30, 'relative', 60, None, 0, 0)
    (2, 6)
    >>> ctbf(20, 'relative', 30, 'relative', 60, 14, 0, 0)
    (2, 4)
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    Return the amount of padding (or clipping) on the left and
    right part of maxcol columns to satisfy the following:

    align_type -- 'left', 'center', 'right', 'relative'
    align_amount -- a percentage when align_type=='relative'
    width_type -- 'fixed', 'relative', 'clip'
    width_amount -- a percentage when width_type=='relative'
        otherwise equal to the width of the widget
    min_width -- a desired minimum width for the widget or None
    left -- a fixed number of columns to pad on the left
    right -- a fixed number of columns to pad on the right

    >>> clrp = calculate_left_right_padding
    >>> clrp(15, 'left', 0, 'given', 10, None, 2, 0)
    (2, 3)
    >>> clrp(15, 'relative', 0, 'given', 10, None, 2, 0)
    (2, 3)
    >>> clrp(15, 'relative', 100, 'given', 10, None, 2, 0)
    (5, 0)
    >>> clrp(15, 'center', 0, 'given', 4, None, 2, 0)
    (6, 5)
    >>> clrp(15, 'left', 0, 'clip', 18, None, 0, 0)
    (0, -3)
    >>> clrp(15, 'right', 0, 'clip', 18, None, 0, -1)
    (-2, -1)
    >>> clrp(15, 'center', 0, 'given', 18, None, 2, 0)
    (0, 0)
    >>> clrp(20, 'left', 0, 'relative', 60, None, 0, 0)
    (0, 8)
    >>> clrp(20, 'relative', 30, 'relative', 60, None, 0, 0)
    (2, 6)
    >>> clrp(20, 'relative', 30, 'relative', 60, 14, 0, 0)
    (2, 4)
    rr�rjNr�r�)	r
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