systems

1. Natural systems in general have the following features:

• Level-1 suit bids denote at least 4 or 5 cards in a major suit, and 3 or 4 cards in a minor suit, with strength of about (11)12-20(22) high card points. The suit bid is generally the longest. The former criterion inflicts further classification into four-card major and five-card major systems.
• Bid of 1NT always presents a balanced hand in a narrow high card points range. The common ranges are 15-17 or 16-18 HCP ("strong notrump") and 12-14 ("weak notrump").
• Bid of 2♣ typically presents a very strong hand (23 HCP up).

A wide variety of systems of interconnected components are called networks. Specific examples include:

• transport networks,

  • roads,

  • railroads,

  • shipping routes and

  • airlines,

Copy of Alexander Graham Bell's original telephone, at the Musée des Arts et Métiers in Paris

Health insurance is a type of insurance whereby the insurer pays the medical costs of the insured if the insured becomes sick due to covered causes, or due to accidents. The insurer may be a private organization or a government agency. Market-based health care systems such as that in the United States rely primarily on private health insurance.

♣

Bidding system is set of agreements and conventions in bidding between two partners in contract bridge. A bidding system defines the meaning of every possible bid by each partner, and presents a codified language which allows the partners to find out about each other's holdings and determine the correct contract.