 Complete the following phrase:  Chad competed at the 2012 Summer Olympics in London, which was held from 27 July to 12 August 2012. This marked the nations eleventh appearance at the Summer Olympics since its debut in the 1964 Summer Olympics. The Chadian delegation included track and field athlete Hinikissia Ndikert and judoka Carine Ngarlemdana. Ngarlemdana was the flag bearer for the opening ceremony and Ndikert was the flag bearer for the 