composer conflict example

gistfile1.txt

Project:
require: {
  "wibble/a": "dev-feature",
  "wibble/b": "dev-feature"
}

A:
require: {
  "wibble/b": "dev-feature",
  "wibble/c": ">=100"
}

C:
require: {
  "wibble/b": ">50"
}