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Modules: Comparable, Enumerable, Errno, GC, Kernel, Marshal, Process, Signal Classes: ARGF, ArgumentError, Array, BasicObject, Bignum, Binding, Class, Complex, Continuation, Data, Dir, ENV, EOFError, Encoding, EncodingError, Enumerator, Exception, FalseClass, Fiber, FiberError, File, FileTest, Fixnum, Float, FloatDomainError, Hash, IO, IOError, IndexError, Integer, Interrupt, KeyError, LoadError, LocalJumpError, MatchData, Math, Method, Module, Mutex, NameError, NilClass, NoMemoryError, NoMethodError, NotImplementedError, Numeric, Object, ObjectSpace, Proc, Random, Range, RangeError, Rational, Regexp, RegexpError, Ripper, RubyVM, RuntimeError, ScriptError, SecurityError, SignalException, StandardError, StopIteration, String, Struct, Symbol, SyntaxError, SystemCallError, SystemExit, SystemStackError, Thread, ThreadError, ThreadGroup, Time, TracePoint, TrueClass, TypeError, UnboundMethod, ZeroDivisionError, fatal