# lfl 2.1.1

- fixed the minimum required version of R to 3.6

# lfl 2.1.0

- the result of algebra() is now an S3 class, implemented print.algebra()
- added involutive negation to algebra()$ni
- added nelson(), lowerEst() handlers of NA for algebra()
- added print() method for linguistic contexts
- added negated=FALSE argument to the lingexpr() function
- implemented bi-residuum of the dragonfly algebra
- implemented order operation of the dragonfly and lowerEst algebras
- added sugeno()
- added fuzzy quantifiers
- deprecated some arguments of the compose() function
- removed deprecated functions: lcut3(), lcut5()

# lfl 2.0.1

- added support for percentual quantifiers in compose()
- documentation spell-check