=begin, =end, concat, upcase, downcase, swapcase, slice, each_byte, each_line, strip, to_i, to_f, oct, hex, ord, chr, sprintf, format, center, ljust, rjust, succ, crypt, shift, sub, gsub, index, rindex, chomp, split, scan, tojis, toeuc, tosjis, length, join, strftime, to_s, divmod, abs, ceil, truncate, round, sin, cos, tan, log, log10, rand, prec_f, prec_i, year, month, day, hour, min, sec, wday, gm, local, strftime, now, local, divmod, wday, at, today, succ, leap?, parsedate, require, unshift, push, pop, slice, fill, clear, flatten, sort, reverse, delete_at, delete, uniq, delete_if, reject, select, assoc, collect, map, each, inject, choice, sample, next, row, max, max_by, fetch, Hash, key?, has_key?, include?, member?, size, default, each_key, each_value, each_pair, keys, values, to_a, indexes, indices, merge, initialize, width, height, self, nil, __FILE__, __LINE__, open, read, close, gets, readlines, ftype, exists, directory, file, dev, ino, mode, nlink, uid, gid, blocks, atime, mtime, utime, chown, dirname, basename, extname, mkdir, unlink, foreach, rename, chdir, pwd, getwd, entries, glob,