Nigeria Ethnic violence for control over the oil-producing Niger Delta region and inadequate infrastructures are some of the issues in the country. Umaru Yar'Adua of the People's Democratic Party (PDP) came into power in the general election of 2007. The international community has been observing Nigerian elections to encourage a free and fair process, and condemned this one as being severely flawed. Yar'Adua died on 5 May 2010. Dr. Goodluck Jonathan was sworn in as Yar'Adua's replacement on 6 May 2010, becoming Nigeria's 14th Head of State, while his vice-president, Namadi Sambo, an architect and former Kaduna State governor, was chosen
S-expression be formatted as pretty printed S-expressions using the function PPRINT (note: with two Ps, short for "pretty"-print). Lisp programs are valid s-expressions, but not all s-expressions are valid Lisp programs. codice_21 is a valid s-expression, but not a valid Lisp program, since Lisp uses prefix notation and a floating point number (here 1.0) is not valid as an operation (the first element of the expression). An S-expression preceded by a single quotation mark, as in codice_22, is syntactic sugar for a quoted S-expression, in this case codice_23. S-Expressions are often compared to XML, a key difference being that S-Expressions are