def mapper(_xs): return _xs.pipe( ops.zip(_xs.pipe(ops.skip(1))), ops.map(sum), )
def create(): return e1.pipe(ops.zip(e2), ops.map(sum))
def create(): return o1.pipe(ops.zip(o2))
def create(): return e2.pipe(ops.zip(e1), ops.map(sum))
def mapper(ys): return ys.pipe( ops.zip(ys), ops.map(sum), )