Words to Describe subprograms

How subprograms often is described ("________ subprograms")

• written
• closed
• useful
• distinct
• smaller
• referential
• sub
• overloaded
• alternative
• necessary
• primitive
• various
• many
• several
• parallel
• specialized
• mathematical
• predefined
• formal
• additional
• defined
• nested
• derived
• purpose
• modular
• appropriate
• internal
• protected
• manageable
• subroutine
• fortran
• corresponding
• intrinsic
• lowest
• basic
• visible
• linear
• supplied
• simpler
• interrelated
• functional
• separate
• generic
• related
• available
• statistical
• following
• associated
• required
• independent
• different
• elementary
• efficient
• callable
• other
• individual
• major
• standard
• local
• dependent
• recursive
• external
• multiple
• level