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"*List specifying the layout of a Buffer Selection Menu buffer.
Each entry specifies a column and is a list of the form of:
-(HEADER MINIMUM-LENGTH MAXIMUM-LENGTH ALIGNMENT FUN-OR-STRING)
+\(HEADER MINIMUM-LENGTH MAXIMUM-LENGTH ALIGNMENT FUN-OR-STRING)
HEADER : string for header for first line or a function
which calculates column title.
MINIMUM-LENGTH : minimum width of column (number or name of function).