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If there was a monthly surplus, why did the national debt increase $110 billion from the last business day of March to the last business day of April?

From the Bureau of the Public Debt:

Date	Debt Held by the Public	Intragovernmental Holdings	Total Public Debt Outstanding
03/30/2012	10,846,824,546,943.15	4,735,254,134,245.54	15,582,078,681,188.69
04/02/2012	10,883,217,233,063.87	4,737,108,765,340.09	15,620,325,998,403.96
04/03/2012	10,885,892,840,514.66	4,730,953,734,424.54	15,616,846,574,939.20
04/04/2012	10,886,893,993,272.96	4,730,828,550,805.99	15,617,722,544,078.95
04/05/2012	10,884,566,084,027.55	4,735,174,086,380.79	15,619,740,170,408.34
04/06/2012	10,884,645,947,631.29	4,733,994,331,951.64	15,618,640,279,582.93
04/09/2012	10,884,773,109,942.45	4,736,672,624,190.38	15,621,445,734,132.83
04/10/2012	10,885,339,078,286.01	4,741,493,518,408.95	15,626,832,596,694.96
04/11/2012	10,886,106,101,181.97	4,731,981,942,323.66	15,618,088,043,505.63
04/12/2012	10,880,527,647,709.21	4,734,467,120,134.11	15,614,994,767,843.32
04/13/2012	10,880,890,738,953.68	4,734,835,298,368.98	15,615,726,037,322.66
04/16/2012	10,903,326,597,003.36	4,751,311,928,394.28	15,654,638,525,397.64
04/17/2012	10,903,987,805,036.21	4,757,586,427,562.61	15,661,574,232,598.82
04/18/2012	10,905,376,996,162.03	4,755,359,667,725.93	15,660,736,663,887.96
04/19/2012	10,857,988,065,192.96	4,757,602,909,829.41	15,615,590,975,022.37
04/20/2012	10,858,146,916,544.62	4,759,211,613,825.31	15,617,358,530,369.93
04/23/2012	10,858,204,873,838.22	4,761,969,175,722.01	15,620,174,049,560.23
04/24/2012	10,859,176,801,419.86	4,769,089,697,288.18	15,628,266,498,708.04
04/25/2012	10,860,722,926,433.74	4,762,562,602,020.67	15,623,285,528,454.41
04/26/2012	10,859,267,672,675.69	4,765,079,937,801.18	15,624,347,610,476.87
04/27/2012	10,859,635,596,261.41	4,764,061,611,155.98	15,623,697,207,417.39
04/30/2012	10,916,070,898,102.68	4,776,297,169,202.55	15,692,368,067,305.23