It is difficult to tie by mistake, unlike the granny knot. The granny knot is the mathematical version of the common granny knot. This is dangerous because the granny knot can slip when heavily loaded. The resulting connected sum is the granny knot. Two consecutive overhands of the same handedness will make a granny knot. The square knot and the granny knot are distinct knots, and have non-homeomorphic complements. Further, it is easily confused with the granny knot, which is a very poor knot. If two identical trefoil knots are used instead, the result is a granny knot. The granny knot is the first step repeated twice, "left over right, tuck under".