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2. Exact cover - Wikipedia

   en.wikipedia.org/wiki/Exact_cover

   In the matrix representation, an exact cover is a selection of rows such that each column contains a 1 in exactly one selected row. Each row represents a choice and each column represents a constraint. For example, the relation contains in the detailed example above can be represented by a 6×7 incidence matrix: 1. 2.

3. Festiniog Railway Letter Service - Wikipedia

   en.wikipedia.org/wiki/Festiniog_Railway_Letter...

   The Festiniog Railway Letter Service is an officially authorised service within the United Kingdom railway system for posting and transmission of letters, and under certain circumstances also delivering the letters directly to intended recipients. The service operates on the Ffestiniog Railway and the Welsh Highland Railway in North Wales and ...

4. I with bowl - Wikipedia

   en.wikipedia.org/wiki/I_with_bowl

   Latin yeru [1] [2] or I with bowl [3] [dubious – discuss] (majuscule: Ь, minuscule: ь) [note 1] is an additional letter of the Latin alphabet based on the Cyrillic soft sign. It was introduced in 1928 into the reformed Yañalif, and later into other alphabets for Soviet minority languages. The letter was designed specifically to represent ...

5. Timeline of the COVID-19 pandemic in Massachusetts

   en.wikipedia.org/wiki/Timeline_of_the_COVID-19...

   On April 9, the Massachusetts Institute of Technology published a preliminary study of sewage samples taken in the Boston area on March 25, in an effort to determine the extent of COVID-19 infections. Based on concentrations of the virus found in the samples, the study suggested that approximately 115,000 of the Boston region's 2.3 million ...

6. First day of issue - Wikipedia

   en.wikipedia.org/wiki/First_day_of_issue

   First day of issue. A first day of issue cover or first day cover (FDC) is a postage stamp on a cover, postal card or stamped envelope franked on the first day the issue is authorized for use [1] within the country or territory of the stamp-issuing authority. Sometimes the issue is made from a temporary or permanent foreign or overseas office.

7. Dancing Barefoot - Wikipedia

   en.wikipedia.org/wiki/Dancing_Barefoot

   "Dancing Barefoot" is a rock song written by Patti Smith and Ivan Král, and released as a second single from the Patti Smith Group's 1979 album Wave. According to the album sleeve, the song was dedicated to women such as Amedeo Modigliani's mistress Jeanne Hébuterne.