[!□] □
[!□=□] □
[!(□ & □)] □
The scan lines can be curved or straight depending on the method chosen to generate the scan motion . Because they rely on Web bugs , DidTheyReadIt and similar tracking programs can only track HTML messages . As another example , a sidebar can have a different media type from the main conference : a video call can have an audio sidebar where the other participants can see the sidebar participants talking but cannot hear them ; or an audio or video conference may have a text sidebar . In other words , we need to understand better how studies can contribute to a " body of knowledge " in order to be able to interpret them better . A major discussion with regard to this issue is concentrated on the question of understanding how different types of studies can effectively improve our understanding of a methodology 's strengths and weaknesses . Finding the Qibla and determining daily prayer times is also essential for the modern Muslim.Electronic instruments can calculate the solutions to both these problems for any location on the planet , and computer programs can accomplish similar tasks . In the portion that remains no cost , kids can still take a tour of a cell and find over 70 photo-enhanced examples of geographic occurrences .