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How do the 5 Mental Hindrances become 10?

The Blessed Buddha once explained:
How, Bhikkhus, is the explanation of the five mental hindrances becoming ten???                
Own sense-desire for anything internal is a hindrance. Others sense-desire and
any sense-desire for anything external is a hindrance too. Sense-desire is thus
twofold by this explanation: Internal and external.
Own ill-will opposing anything internal is a hindrance. Others ill-will & any aversion
opposing anything external are hindrances too. A dual ill-will can thus be defined.
Any lethargy is a mental hindrance. Any laziness is indeed also a mental hindrance.
Lethargy and laziness therefore, becomes an obstructing double mental hindrance.
All restlessness there is, is a mental hindrance. Whatever regret there is, is also
a hindrance. Therefore can restlessness & regret be explained as two hindrances.
Any doubt and uncertainty about any internal personal condition, is a hindrance.
Any doubt and uncertainty about any other external condition, is also a hindrance.
Thus does doubt and uncertainty become explained, as a matched mirror pair.