are labelled semantics, and must be expressed in ambiguity-prone natural language prose, and then implemented in compilers as ad hoc code attached to the formal language parser.

The main aims and principles of design of ALGOL 68 are:

# Completeness and clarity of description
# Orthogonality of design
# Security
# Efficiency:
#* Static mode checking
#* Mode-independent parsing
#* Independent compiling
#* Loop optimizing
#* Representations - in minimal

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