It might be that the two base-pair system is the best.

ECONOMIST: A new kind of DNA

The base price for a custom-made pair of Louboutins is four thousand dollars.

NEWYORKER: Sole Mate

Rather than inventing a new base pair, they have co-opted the least common of the three stop codons and used it to code for various new amino acids.

ECONOMIST: Chemists are trying to synthesise new varieties of life

Currently the currency pair is building a solid base towards 1.3250-60.

FORBES: Is The Euro Relying on Excuses?

The pair live for one dream: to find a way of tunneling--into your customer base!

FORBES: BET ON THE HARES

The joint inquest was told that the pair suffered horrific injuries when a mortar smashed into their operating base in the northern part of the Nahr-e Saraj district.

BBC: Base improvements 'too late' for soldiers, inquest told