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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _make_postfixes_1( analysis ):
    ''' Provides some post-fixes. '''
    assert FORM in analysis, '(!) The input analysis does not contain "'+FORM+'" key.'
    if 'neg' in analysis[FORM]:
        analysis[FORM] = re.sub( '^\s*neg ([^,]*)$',  '\\1 Neg',  analysis[FORM] )
    analysis[FORM] = re.sub( ' Neg Neg$',  ' Neg',  analysis[FORM] )
    analysis[FORM] = re.sub( ' Aff Neg$',  ' Neg',  analysis[FORM] )
    analysis[FORM] = re.sub( 'neg',  'Neg',  analysis[FORM] )
    analysis[FORM] = analysis[FORM].rstrip().lstrip()
    assert 'neg' not in analysis[FORM], \
                 '(!) The label "neg" should be removed by now.'
    assert 'Neg' not in analysis[FORM] or ('Neg' in analysis[FORM] and analysis[FORM].endswith('Neg')), \
                 '(!) The label "Neg" should end the analysis line: '+str(analysis[FORM])
    return analysis