Background: Mary Mary are an American gospel duo composed of sisters Erica Atkins-Campbell and Trecina Atkins-Campbell. Formed in 1998, Mary Mary was launched into mainstream recognition following the release of their best-selling debut album, Thankful (2000), which contained the hit single "Shackles (Praise You)". Their followup album Incredible (2002), reached number one on the Top Gospel Albums chart. Their third album, Mary Mary (2005), which contains themes the public interpreted as a channel to the group's experience, contains the worldwide hits "Heaven", "The Real Party", and "Yesterday".
Context: The Atkins sisters, born Erica Monique and Trecina Evette, grew up in a large family with seven siblings in Inglewood, California. Their mother, Thomasina Atkins, is an evangelist and choir director at the Church of God in Christ. Their father, Eddie A. Atkins, was also a member of the Church of God In Christ, and a youth counselor, before he died in 2013.  Due to their proximity in age, the two sisters grew up closer to one another than to any of their siblings: Darrell Atkins (born 1965, the only living boy- the second boy died as a child), Maliea Atkins (born 1967), Erica (born 1972), Tina (born 1974), Delisa Atkins-Brown (born 1977), Thomasina Atkins (born 1979), Alana Atkins-Jamison (born 1985), and Shanta Atkins (born 1986). Later, they would work creatively with over half of their siblings; Thomasina, Alana, Delisa and Shanta Atkins all sing background on Mary Mary's albums and during stage performances and Delisa was originally a member of the group but left before they started recording professionally due to pursuing college. Eventually, all eight Atkins children united on the Bobby Jones Gospel show on BET.  During this time, Erica and Trecina entered the world of church choirs, traveling gospel shows, and television productions. The sisters enrolled at El Camino College to study voice. There they encountered the division between rigorous academic study of music versus the popular musical world. "We had to study classical and sing arias, which was fine," Erica told Times, "but the teachers would tell us if we sang anything else it would damage our instrument." In 1995 the two toured with Michael Matthews' traveling gospel shows, Mama I'm Sorry and Sneaky. Each sister subsequently toured as a backup singer for a variety of R&B acts, including Brandy.
Question: When did they decide to get into singing?
Answer: Delisa was originally a member of the group but left before they started recording professionally due to pursuing college.

Problem: Background: Charles-Edouard Jeanneret, known as Le Corbusier (French: [l@ koRby'zje]; 6 October 1887 - 27 August 1965), was a Swiss-French architect, designer, painter, urban planner, writer, and one of the pioneers of what is now called modern architecture. He was born in Switzerland and became a French citizen in 1930. His career spanned five decades and he designed buildings in Europe, Japan, India, and North and South America.
Context: Le Corbusier moved to Paris definitively in 1917 and began his own architectural practice with his cousin, Pierre Jeanneret (1896-1967), a partnership that would last until the 1950s, with an interruption in the World War II years  In 1918, Le Corbusier met the Cubist painter Amedee Ozenfant, in whom he recognised a kindred spirit. Ozenfant encouraged him to paint, and the two began a period of collaboration. Rejecting Cubism as irrational and "romantic", the pair jointly published their manifesto, Apres le cubisme and established a new artistic movement, Purism. Ozenfant and Le Corbusier began writing for a new journal, L'Esprit Nouveau, and promoted with energy and imagination his ideas of architecture.  In the first issue of the journal, in 1920, Charles-Edouard Jeanneret adopted Le Corbusier (an altered form of his maternal grandfather's name, Lecorbesier) as a pseudonym, reflecting his belief that anyone could reinvent themselves. Adopting a single name to identify oneself was in vogue by artists in many fields during that era, especially in Paris.  Between 1918 and 1922, Le Corbusier did not build anything, concentrating his efforts on Purist theory and painting. In 1922, he and his cousin Pierre Jeanneret opened a studio in Paris at 35 rue de Sevres. His theoretical studies soon advanced into several different single-family house models. Among these was the Maison "Citrohan", a pun on the name of the French Citroen automaker, for the modern industrial methods and materials Le Corbusier advocated using for the house. Here, Le Corbusier proposed a three-floor structure, with a double-height living room, bedrooms on the second floor, and a kitchen on the third floor. The roof would be occupied by a sun terrace. On the exterior Le Corbusier installed a stairway to provide second-floor access from ground level. Here, as in other projects from this period, he also designed the facades to include large uninterrupted banks of windows. The house used a rectangular plan, with exterior walls that were not filled by windows but left as white, stuccoed spaces. Le Corbusier and Jeanneret left the interior aesthetically spare, with any movable furniture made of tubular metal frames. Light fixtures usually comprised single, bare bulbs. Interior walls also were left white.
Question: How did Le Corbusier know Ozefant?
Answer:
In 1918, Le Corbusier met the Cubist painter Amedee Ozenfant, in whom he recognised a kindred spirit.